Add contribute_to_android_api property in java_sdk_library

The default-false bool property `contribute_to_android_api` will be used to signify whether the java_sdk_library module contributes to an api
surface (i.e. listed in frameworks-base-api.bootclasspath or not).
If the property is set to true, the module's stub jar can be
generated from .txt files.

Currently, the property is a no-op. The property will be utilized in the
child changes.

Test: m nothing
Bug: 276958307
Change-Id: I617802ec352c7055579ce92ea3de43f10cac1da4