fix(litellm): add litellm as an extra dependency

Author: constantinius

setup.py

@@ -65,6 +65,7 @@ def get_file_text(file_name):
         "langchain": ["langchain>=0.0.210"],
         "langgraph": ["langgraph>=0.6.6"],
         "launchdarkly": ["launchdarkly-server-sdk>=9.8.0"],
+        "litellm": ["litellm>=1.77.5"],
         "litestar": ["litestar>=2.0.0"],
         "loguru": ["loguru>=0.5"],
         "openai": ["openai>=1.0.0", "tiktoken>=0.3.0"],