feat: add OAuth 2.0 and OpenID Connect sources

[d3vyce]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 5 untouched benchmarks
🆕 1 new benchmark

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
🆕	test_multiauth_dispatch_scoped	N/A	186.8 µs	N/A

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_{Comparing 62-add-oauth-20-and-openid-connect-sources (67807ce) with main (b5eda65)}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.72131% with 2 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/fastapi_multiauth/sources/multi.py	81.81%	1 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
src/fastapi_multiauth/__init__.py	100.00% <ø> (ø)
src/fastapi_multiauth/abc.py	100.00% <100.00%> (ø)
src/fastapi_multiauth/sources/__init__.py	100.00% <100.00%> (ø)
src/fastapi_multiauth/sources/bearer.py	100.00% <100.00%> (ø)
src/fastapi_multiauth/sources/oauth2.py	100.00% <100.00%> (ø)
src/fastapi_multiauth/sources/multi.py	96.72% <81.81%> (+0.29%)	⬆️