Support scala android plugin on Gradle

[Arthurm1]

Currently any Gradle Android projects only get a java section not a scala section in the Bloop json exports because there's no real link between the Android sourcesets and java/scala sourcesets so the ScalaCompile info is just floating about.

This PR assumes that if the project has ScalaCompile applied to it then that info should be exported.

So https://github.com/dsvdsv/scala-android-plugin is now supported. It looks dead as it doesn't support later versions of Gradle or Android, but why not.
I've left the test for it commented out as the GradleRunner seems to apply plugins in a different order than real-life Gradle so the test fails on configuration. Testing this on a local build.gradle file appears to work.

Hopefully this should solve scalameta/metals#4036

[Arthurm1]

Spurious test failure bloop.launcher.LatestStableLauncherSpec

[tgodzik]

LGTM!