Add Bearer (JWT) authentication

[lafrech]

Also rework Basic authentication.

[codecov]

Codecov Report

Attention: Patch coverage is 96.61017% with 4 lines in your changes missing coverage. Please review.

Project coverage is 99.36%. Comparing base (5d1a45e) to head (9891cf1).

Files	Patch %	Lines
src/bemserver_api/extensions/authentication.py	94.80%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #233      +/-   ##
==========================================
- Coverage   99.39%   99.36%   -0.03%     
==========================================
  Files         191      192       +1     
  Lines        4622     4721      +99     
  Branches     1613     1630      +17     
==========================================
+ Hits         4594     4691      +97     
- Misses         14       15       +1     
- Partials       14       15       +1     

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