Create aliases for stubs in build/bazel/api_surfaces

- Create the alias under the module-libapi directory. This is the
  api_surface that cc_stubs_suite maps to.
- Create the alias only for "current" (atleast for now)
- Create one alias for the stub shared lib, and another for its headers

Test: b build @api_surfaces//... (with aosp/2475091)
Change-Id: Ib004c2c34256f971e74d75317fa5fbbe7273720e