Setup Stable AIDL composer VTS tests.

This is a setup on which I can start writing tests by creating composer client first.

Test: Verified with a placeholder test that we can execute tests
NOTE: Tests don't work as there is no service, so empty tests should be skipped in presubmits automatically.
BUG: 201797934
Change-Id: I1b6aca6c497bf60c5a417533508e30100192625a