Generate stub API jar for layoutlib

On Studio, we might need to use an API jar for Layoutlib to avoid using
reflection when calling to it. This CL adds the code to generate that
API jar.
This also adds guava to the Create module.

Bug: N/A
Test: Added test
Change-Id: I8a0a0440751e92452735268820178d3ff203b59b
15 files changed