Add source file provider for genrule/srcs, python libraries and rust libraries.

Ignore-AOSP-First: CPing test_spec rule to udc-mainline-prod to support migration of test targets. Cherry pick of:aosp/2786121

Change-Id: I2d7d4684a10c15aeecc27b8db800ab27a807d2e2
Merged-In: I2d7d4684a10c15aeecc27b8db800ab27a807d2e2