Add dep_api_srcs property to java_api_library module

Users can pass the jar-file creating module via dep_api_srcs property in
java_api_library to create the jar file not by compiling the stubs
generated from metalava but by extracting and zipping the class files
from the jar file of the input module.

Test: m android-non-updatable.stubs.from-text
Bug: 273381329
Change-Id: Id1b75179111cc7ff45faaff58388db1347bb18e5