Consider generating R class bytecode directly.

[arunkumar9t2]

Currently stub compiler generates R.java and other databinding classes for Kotlin compilation to work. The R.java in particular is compiled independently to allow not link it in runtime using never_link. This can be avoided by simply generating the R class as .class file using Java bytecode manipulation and pass it to Kotlin target via a JavaInfo provider.

On large modules R class compilation will not be a botteneck.