* test: initial commit enforcing testing on all anthropic pass through functions
prevents future regressions
* test(test_unit_test_anthropic_pass_through.py): add unit test for '_get_user_from_metadata' function
* test(test_unit_test_anthropic_passthrough.py): add unit test for handle_logging_anthropic_collected_chunks
* test(test_unit_test_anthropic_pass_through): add coverage for all anthropic pass through functions
