Add support for min_sdk_version

Add min_sdk_version properties and use it for aapt2
--min-sdk-version and --target-sdk-version flags.  Add an sdkContext
interface that any function that needs an sdk version can take in
order to get the values for the current module.

Bug: 110848854
Test: m checkbuild
Change-Id: Ic69f1f935d8b865ec77689350407df08bfac5925