Specify the sdk_version of "services-non-updatable-stubs"

This change modifies the sdk_version of services-non-updatable-stubs
from "private" to "module_lib".

Implementation details:
- Create the filegroup of services aidl sources and pass as sources of
  services-non-updatable-stubs. Note that this does not affect the
  generated stubs and the api files as the aidl sources are not within
  "com.android." package
- Specify the sdk_version and pass "framework-annotations-lib" as libs

Test: m services-non-updatable-stubs-check-current-api
Test: BUILD_FROM_SOURCE_STUBS=true m nothing
Bug: 327507877
Change-Id: I2a51da40d5ec374dff73029657c7874f9cec8413