Explore jar minifying with D8/R8

[jkleckner]

This is really just to flag an interesting idea about minifying jar files using D8/R8 explored by Jake Wharton here [1] on Kotlin jar files where he achieved compression of around 99%. Imagine hooking that transformation here as well!

Very cool.

[1] https://jakewharton.com/shrinking-a-kotlin-binary/