[CLIENT-4158] Move to Google style docstrings.

[juliannguyen4]

TODO

• Remove outdated docstrings in the C source code.
• Generate docs from these docstrings in .pyi

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.48%. Comparing base (88dadfa) to head (86efac5).
⚠️ Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #995   +/-   ##
=======================================
  Coverage   83.48%   83.48%           
=======================================
  Files          99       99           
  Lines       14402    14402           
=======================================
  Hits        12024    12024           
  Misses       2378     2378           

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