Detect formatting-only changes in JVM languages with `isFormattingChange`

[tresat]

Is your feature request related to a problem? Please describe.
I'd like gitStream to properly detect formatting-only changes (whitespace, indentation fixes, etc.) to JVM language files like Java, Kotlin, Groovy. The check is currently limited to only a few languages as described here https://docs.gitstream.cm/filter-functions/#isformattingchange.

Describe the solution you'd like
isFormattingChange to support JVM languages.

Describe alternatives you've considered
Dropping this automation from our project.

Additional context
Perhaps the minifier used for Android could be used to implement this: https://www.guardsquare.com/proguard?

[BenLloydPearson]

Thanks for the suggestion! This is a great idea and is something that we want to do for a wide range of languages.

However, the challenge is that we have to implement a new engine to check this for each language. We solved Python and JavaScript first because that's what gitStream is built with so we didn't have to make major changes to support them.

I'll update this issue with any further details we have about supporting new languages with isFormattingChange.