Allow access to resource identifiers for drawables

[jhugman]

This is No Bug followup for #4784 .

It allows access to the drawable resource identifier which is commonly used in Android app development.

It also has a small quality of life improvement for FML developers to generate code with a minimal set of imports.

Unneeded imports in the generated code is a large class of breaking changes.

This will minimize any breaking changes to only people already using Drawables (which I think is zero since it's a very new feature).

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[tarikeshaq]

Looks good! Like how the imports are not managed by the specific types!! 🚀 I'll land this so that we can ship it with the upcoming release