feat: more extension points

[hperl]

This adds more extension points to the Kratos registry.

[aeneasr]

Looks like provider became Provider in some files due to probably some refactoring. Also the API spec looks not fully correct yet. Otherwise LGTM

[aeneasr]

See previous review

[codecov]

Codecov Report

Attention: Patch coverage is 46.01770% with 61 lines in your changes missing coverage. Please review.

Project coverage is 78.55%. Comparing base (7ca3b6b) to head (4ac0f42).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
selfservice/strategy/oidc/strategy_registration.go	34.48%	18 Missing and 1 partial ⚠️
selfservice/strategy/oidc/strategy_login.go	42.85%	12 Missing ⚠️
selfservice/strategy/oidc/strategy.go	52.63%	9 Missing ⚠️
driver/registry_default.go	27.27%	4 Missing and 4 partials ⚠️
selfservice/strategy/oidc/provider_test_fedcm.go	80.00%	2 Missing and 2 partials ⚠️
selfservice/strategy/oidc/token_verifier.go	33.33%	2 Missing and 2 partials ⚠️
driver/registry.go	0.00%	3 Missing ⚠️
driver/registry_default_hooks.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4272      +/-   ##
==========================================
- Coverage   78.59%   78.55%   -0.04%     
==========================================
  Files         381      381              
  Lines       27382    27368      -14     
==========================================
- Hits        21521    21500      -21     
- Misses       4238     4244       +6     
- Partials     1623     1624       +1     

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PTAL :)