Refactor keyboard to use Jetpack Compose

[andrewtavis]

Terms

• I have searched open and closed issues
• I agree to follow Scribe-Android's Code of Conduct

Issue

@angrezichatterbox and @Roniscend have been making initial plans and implementing a version of Scribe keyboards that uses Jetpack Compose. This would finalize the conversion of the application over to using modern Android/Kotlin practices.

[andrewtavis]

@angrezichatterbox and @Roniscend: Hope it's ok that I made the issue :) I think it makes sense that this work is reflected on the board 😊