Make GrpcStatus implement GrpcExceptionHandlerFunction

[ikhoon]

Although we use GrpcStatus as the default implementation of GrpcExceptionHandlerFunction, it does not implement GrpcExceptionHandlerFunction.

armeria/grpc/src/main/java/com/linecorp/armeria/internal/common/grpc/GrpcStatus.java

Lines 79 to 80 in db3973d

	public final class GrpcStatus {

It would be good to refactor GrpcStatus and rename it to DefaultGrpcExceptionHandlerFunction. Afterward, DefaultGrpcExceptionHandlerFunction can be set to GrpcServiceBuilder and GrpcClientBuilder as default values.

armeria/grpc/src/main/java/com/linecorp/armeria/server/grpc/GrpcServiceBuilder.java

Line 118 in db3973d

private GrpcExceptionHandlerFunction exceptionHandler;

armeria/grpc/src/main/java/com/linecorp/armeria/client/grpc/GrpcClientBuilder.java

Line 104 in db3973d

private GrpcExceptionHandlerFunction exceptionHandler;

[trustin]

Maybe instead add asExceptionHandler()? It sounds somewhat unnatural for a status constant to be a function.

[trustin]

Actually, never mind. I should have read the details of this issue before writing a comment 😓