feat: Add new gcloud commands, API clients, and third-party libraries across various services.

gcloud auth application-default login/google-cloud-sdk/lib/third_party/argparse/LICENSE.txt

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+argparse is (c) 2006-2009 Steven J. Bethard <steven.bethard@gmail.com>.
+
+The argparse module was contributed to Python as of Python 2.7 and thus
+was licensed under the Python license. Same license applies to all files in
+the argparse package project.
+
+For details about the Python License, please see doc/Python-License.txt.
+
+History
+-------
+
+Before (and including) argparse 1.1, the argparse package was licensed under
+Apache License v2.0.
+
+After argparse 1.1, all project files from the argparse project were deleted
+due to license compatibility issues between Apache License 2.0 and GNU GPL v2.
+
+The project repository then had a clean start with some files taken from
+Python 2.7.1, so definitely all files are under Python License now.
+

gcloud auth application-default login/google-cloud-sdk/lib/third_party/argparse/NEWS.txt

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+What's New
+==========
+
+argparse 1.2.1
+--------------
+
+- fixed Issue #82: argparse 1.2 incompatible with Python 3.1
+- hacked the tests so they don't have the minor failures that were caused
+  by the compatibility stuff for python 2.3 and 3.1
+
+argparse 1.2
+------------
+
+- fixed Issue #79: re-licensed argparse package under same license as py 2.7 stdlib argparse code
+- fixed Issue #80: argparse 1.2 is now same archive on pypi / on google code
+

gcloud auth application-default login/google-cloud-sdk/lib/third_party/argparse/README.txt

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+The argparse module makes it easy to write user friendly command line
+interfaces.
+
+The program defines what arguments it requires, and argparse will figure out
+how to parse those out of sys.argv. The argparse module also automatically
+generates help and usage messages and issues errors when users give the
+program invalid arguments.
+
+As of Python >= 2.7 and >= 3.2, the argparse module is maintained within the
+Python standard library. For users who still need to support Python < 2.7 or
+< 3.2, it is also provided as a separate package, which tries to stay
+compatible with the module in the standard library, but also supports older
+Python versions.
+
+argparse is licensed under the Python license, for details see LICENSE.txt.
+
+
+Compatibility
+-------------
+
+argparse should work on Python >= 2.3, it was tested on:
+
+* 2.3.5, 2.4.4, 2.5.5, 2.6.5 and 2.7
+* 3.1, 3.2
+
+
+Installation
+------------
+
+Try one of these:
+
+    python setup.py install
+
+    easy_install argparse
+
+    pip install argparse
+
+    putting argparse.py in some directory listed in sys.path should also work
+
+
+Bugs
+----
+
+If you find a bug, please try to reproduce it with python 2.7.
+
+If it happens there also, please file a bug in the python.org issue tracker.
+If it does not happen in 2.7, file a bug in the argparse package issue tracker.
+