Added pytest for pydantic protected namespace warning

litellm/tests/test_pydantic_namespaces.py

@@ -0,0 +1,10 @@
+import warnings
+import pytest
+
+def test_namespace_conflict_warning():
+    with warnings.catch_warnings(record=True) as recorded_warnings:
+        warnings.simplefilter("always")  # Capture all warnings
+        import litellm
+
+    # Check that no warning with the specific message was raised
+    assert not any("conflict with protected namespace" in str(w.message) for w in recorded_warnings), "Test failed: 'conflict with protected namespace' warning was encountered!"