GitLab

* Add cpp macro to append wrapped language info to xDS user agent

* Add Python xDS user agent

* fix redefinition error and add macro for wrapped lang version

* clang-format

* Revert xds_api.cc changes

* Use two separate macros

* Yapf

* Regenerate projects

* Include _metadata.py in source distributions

* Attempt to fix quote escaping on Windows
Co-authored-by: Mark D. Roth <roth@google.com>