Moves unittests to root folder and adds github action to run unit tests. (#72)

* 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

pyproject.toml

@@ -79,7 +79,11 @@ eval = [
 
 test = [
   # go/keep-sorted start
+  "anthropic>=0.43.0",               # For anthropic model tests
   "langchain-community>=0.3.17",
+  "langgraph>=0.2.60",               # For LangGraphAgent
+  "litellm>=1.63.11",                # For LiteLLM tests
+  "llama-index-readers-file>=0.4.0", # for retrieval tests
   "pytest-asyncio>=0.25.0",
   "pytest-mock>=3.14.0",
   "pytest-xdist>=3.6.1",