java_sdk_library: Add support for module_lib API surface

Adds api scope for the module_lib and adds that to the list of all
all available scopes. The scope is generated if and only if the
api_surfaces property contains "module_lib".

No other changes are needed as the generation of the APIs is completely
driven by the allApiScopes array and the information in its contained
apiScope structures.

Test: m checkapi
Bug: 155164730
Change-Id: I7769af6823badca8715a270f86cf53b4e954b7df