[CLIENT-3161] Type stubs: add TypedDict class for the client config dictionary

[juliannguyen4]

• [x] Manually verified that we can import our subclasses of typeddict and use them with the Python client

todo: add test using mypy to check that this doesn't break applications with static checking

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.89%. Comparing base (ca2f4be) to head (120f84e). Report is 7 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #690   +/-   ##
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  Coverage   80.89%   80.89%           
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  Files         102      102           
  Lines       15186    15186           
=======================================
  Hits        12285    12285           
  Misses       2901     2901           

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