feature: support for RFC9728, #121

[guillp]

Initial support for initializing an ApiClient with a Protected Resource Metadata endpoint or document.

[codecov]

Codecov Report

Attention: Patch coverage is 86.44068% with 8 lines in your changes missing coverage. Please review.

Project coverage is 99.59%. Comparing base (71c1247) to head (c8b1f41).

Files with missing lines	Patch %	Lines
requests_oauth2client/api_client.py	79.41%	7 Missing ⚠️
requests_oauth2client/discovery.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #145      +/-   ##
===========================================
- Coverage   100.00%   99.59%   -0.41%     
===========================================
  Files           19       19              
  Lines         1934     1989      +55     
===========================================
+ Hits          1934     1981      +47     
- Misses           0        8       +8     

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