Refactor remotes module

[Theta-Dev]

Description

Refactoring of the remotes module to make the integration of new code forges easier.

Motivation and Context

When I added Gitea integration (#680), I noticed a lot of redundant code blocks in the application which have to be copied for every code forge integration added. So I tried to rework the system to allow adding new remotes with minimal changes to the application.

Adding a new application now only consists of the following steps:

• Add new feature to Cargo.toml
• Implement the fetching and parsing in remote/<name>.rs
• Add a new variant to the RemoteKind enum in config.rs and add it to the REMOTE_KINDS array

This obviously comes with breaking changes to the API of the remote module.

How Has This Been Tested?

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.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 23.82353% with 259 lines in your changes missing coverage. Please review.

Project coverage is 35.90%. Comparing base (832edbc) to head (c907098).

Files	Patch %	Lines
git-cliff-core/src/remote/gitea.rs	0.00%	41 Missing ⚠️
git-cliff-core/src/remote/mod.rs	18.00%	41 Missing ⚠️
git-cliff-core/src/remote/gitlab.rs	0.00%	38 Missing ⚠️
git-cliff-core/src/remote/bitbucket.rs	0.00%	29 Missing ⚠️
git-cliff-core/src/remote/github.rs	0.00%	29 Missing ⚠️
git-cliff/src/lib.rs	0.00%	23 Missing ⚠️
git-cliff-core/src/changelog.rs	45.72%	19 Missing ⚠️
git-cliff/src/args.rs	42.86%	16 Missing ⚠️
git-cliff-core/src/config.rs	52.18%	11 Missing ⚠️
git-cliff-core/src/release.rs	83.34%	6 Missing ⚠️
... and 2 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
- Coverage   36.89%   35.90%   -0.99%     
==========================================
  Files          18       19       +1     
  Lines        1350     1382      +32     
==========================================
- Hits          498      496       -2     
- Misses        852      886      +34     

Flag	Coverage Δ
unit-tests	35.90% <23.83%> (-0.99%)	⬇️

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[orhun]

Hey, thanks for your work on this! Should we mark as draft until #680 is merged (since this PR is based on those changes?)

[Theta-Dev]

Okay. It still needs some documentation work done, since there is now a new URL config option to better support self-hosted instances.

[orhun]

Thanks a lot for #680, it is merged now which means we can resume the work on this PR!

[orhun]

ping @Theta-Dev