feat(codeberg): add Gitea support

[Theta-Dev]

Description

Add Gitea/Forgejo integration, similar to #663

Motivation and Context

How Has This Been Tested?

Tested manually as well as using a test fixture.

Test repo on Codeberg: https://codeberg.org/ThetaDev/git-cliff-readme-example

Screenshots / Logs (if applicable)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines! ⛰️

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 24.46809% with 71 lines in your changes missing coverage. Please review.

Project coverage is 36.36%. Comparing base (5b58a37) to head (e0bb0cc).

Files	Patch %	Lines
git-cliff-core/src/changelog.rs	27.78%	26 Missing ⚠️
git-cliff-core/src/remote/gitea.rs	32.44%	25 Missing ⚠️
git-cliff/src/lib.rs	0.00%	10 Missing ⚠️
git-cliff/src/logger.rs	0.00%	9 Missing ⚠️
git-cliff-core/src/commit.rs	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #680      +/-   ##
==========================================
- Coverage   37.08%   36.36%   -0.72%     
==========================================
  Files          18       19       +1     
  Lines        1354     1447      +93     
==========================================
+ Hits          502      526      +24     
- Misses        852      921      +69     

Flag	Coverage Δ
unit-tests	36.36% <24.47%> (-0.72%)	⬇️

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[dark0dave]

This looks great! Thank you for doing this!

[orhun]

so fire

[welcome]

Congrats on merging your first pull request! ⛰️