Allow google-format version specification for removeUnusedImports

[weisJ]

When using removeUnusedImports() with Jdk 14 autostyleApply fails when using the new switch-expression syntax.
This is because the default version of google-java-format does not support the new syntax.
It would be great if either

• the default version could be updated
• or there was an option to specify the default version in this case oneself.

Example to reproduce:

public class SwitchSyntax {

    public static void main(String[] args) {
        int i = 0;
        int j = switch(i) {
            case 1 -> 2;
            case 2 -> 3;
            default -> 4;
        };
    }
}

results in

    Execution failed for task ':autostyleJavaApply':
        com.github.autostyle.FormatterException: Error while formatting src\main\java\SwitchSyntax.java: 5:18: error: illegal start of expression
            at com.github.autostyle.Formatter.compute(Formatter.java:226)
            at com.github.autostyle.Formatter.applyToAndReturnResultIfDirty(Formatter.java:177)
            at com.github.autostyle.gradle.AutostyleApplyTask.applyFormat(AutostyleApplyTask.kt:116)
            at com.github.autostyle.gradle.AutostyleApplyTask.performAction(AutostyleApplyTask.kt:88)
            at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104)
            at org.gradle.api.internal.project.taskfactory.IncrementalInputsTaskAction.doExecute(IncrementalInputsTaskAction.java:32)
            at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:51)
            at org.gradle.api.internal.project.taskfactory.AbstractIncrementalTaskAction.execute(AbstractIncrementalTaskAction.java:25)
            at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:29)
            at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.run(ExecuteActionsTaskExecuter.java:570)
            at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:395)
            at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:387)
            at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
            at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
            at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
            at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:84)
            at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
            at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:555)
            at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:538)
            at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$300(ExecuteActionsTaskExecuter.java:109)
            at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:279)
            at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:268)
            at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$0(ExecuteStep.java:32)
            at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:32)
            at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26)
            at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:67)
            at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:36)
            at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:49)
            at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:34)
            at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:43)
            at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73)
            at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54)
            at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34)
            at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:44)
            at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:54)
            at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:38)
            at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49)
            at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:159)
            at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:72)
            at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:43)
            at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:44)
            at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:33)
            at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38)
            at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24)
            at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:92)
            at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:85)
            at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55)
            at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:39)
            at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:76)
            at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37)
            at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36)
            at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26)
            at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:94)
            at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:49)
            at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:79)
            at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:53)
            at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:74)
            at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:78)
            at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:78)
            at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:34)
            at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:39)
            at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:40)
            at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:28)
            Caused by: com.google.googlejavaformat.java.FormatterException: 5:18: error: illegal start of expression
                at com.google.googlejavaformat.java.FormatterException.fromJavacDiagnostics(FormatterException.java:50)
            Caused by: com.google.googlejavaformat.java.FormatterException: 5:18: error: illegal start of expression

                at com.google.googlejavaformat.java.RemoveUnusedImports.parse(RemoveUnusedImports.java:253)
                at com.google.googlejavaformat.java.RemoveUnusedImports.removeUnusedImports(RemoveUnusedImports.java:211)
                at com.google.googlejavaformat.java.RemoveUnusedImports.removeUnusedImports(RemoveUnusedImports.java:204)
                at com.github.autostyle.java.GoogleJavaFormatStep$State.lambda$createRemoveUnusedImportsOnly$1(GoogleJavaFormatStep.java:156)
                at com.github.autostyle.FormatterFunc.apply(FormatterFunc.java:31)
                at com.github.autostyle.FormatterStepImpl$Standard.format(FormatterStepImpl.java:77)
                at com.github.autostyle.FormatterStep$Strict.format(FormatterStep.java:76)
                at com.github.autostyle.Formatter.compute(Formatter.java:215)
                ... 62 more