sources: add Telegram source

[atereshkin]

Details

This implements Telegram social login provider as requested in #2232

Closes #2232

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make docs)

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[codecov]

Codecov Report

❌ Patch coverage is 99.65157% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.44%. Comparing base (ac79acd) to head (97057b2).

Files with missing lines	Patch %	Lines
authentik/sources/telegram/views.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15749      +/-   ##
==========================================
+ Coverage   92.43%   92.44%   +0.01%     
==========================================
  Files         831      839       +8     
  Lines       44471    44758     +287     
==========================================
+ Hits        41108    41378     +270     
- Misses       3363     3380      +17     

Flag	Coverage Δ
e2e	45.35% <51.21%> (-0.34%)	⬇️
integration	23.58% <17.07%> (-0.05%)	⬇️
unit	90.88% <99.65%> (+0.05%)	⬆️

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[tanberry]

Thanks so much @atereshkin for adding the docs for Telegram. A few nits to address please, but looks great, LGTM!!

[tanberry]

Oh, also @atereshkin in order to resolve some of the build checks fails, you might need to 1. rebase your local repo on upstream main in order to pick up some changes in our build tools, and 2. run make docs-install to instlal those new tools/versions.

[tanberry]

Thanks @atereshkin !