COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/260 from google:hangfei-patch-1 f514134c4fc3ad340dd274a38d01cc6f77056339 PiperOrigin-RevId: 748934896
PiperOrigin-RevId: 748918432
fix test dependency
* Move unit tests to root package. * Adds deps to "test" extra, and mark two broken tests in tests/unittests/auth/test_auth_handler.py * Adds github workflow * minor fix in lite_llm.py for python 3.9. * format pyproject.toml