providers/oauth2: initial client_credentials grant support

[BeryJu]

Signed-off-by: Jens Langhammer jens.langhammer@beryju.org

Details

• Does this resolve an issue?
  Resolves #

Changes

New Features

• Adds feature which does x, y, and z.

Breaking Changes

• Adds breaking change which causes <issue>.

Additional

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[codecov]

Codecov Report

Merging #2437 (52e7c8f) into master (680d4fc) will decrease coverage by 0.05%.
The diff coverage is 94.40%.

@@            Coverage Diff             @@
##           master    #2437      +/-   ##
==========================================
- Coverage   91.58%   91.54%   -0.04%     
==========================================
  Files         452      453       +1     
  Lines       19620    19721     +101     
==========================================
+ Hits        17967    18051      +84     
- Misses       1653     1670      +17     

Impacted Files	Coverage Δ
authentik/providers/oauth2/views/provider.py	100.00% <ø> (ø)
authentik/providers/oauth2/views/token.py	82.07% <88.53%> (+4.99%)	⬆️
authentik/core/auth.py	100.00% <100.00%> (ø)
authentik/providers/oauth2/constants.py	100.00% <100.00%> (ø)
authentik/providers/oauth2/errors.py	83.08% <100.00%> (ø)
...ders/oauth2/tests/test_token_client_credentials.py	100.00% <100.00%> (ø)
authentik/events/models.py	75.58% <0.00%> (-7.25%)	⬇️
authentik/events/tasks.py	85.34% <0.00%> (-4.00%)	⬇️
authentik/stages/email/tasks.py	86.45% <0.00%> (-1.69%)	⬇️
authentik/policies/models.py	97.37% <0.00%> (+2.64%)	⬆️
... and 1 more

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