refactor: move all testing to top-level of repo

Closes https://github.com/BerriAI/litellm/issues/486

tests/local_testing/test_validate_environment.py

@@ -0,0 +1,13 @@
+#### What this tests ####
+#    This tests the validate environment function
+
+import sys, os
+import traceback
+
+sys.path.insert(
+    0, os.path.abspath("../..")
+)  # Adds the parent directory to the system path
+import time
+import litellm
+
+print(litellm.validate_environment("openai/gpt-3.5-turbo"))