feat: Add Haskell (Cabal) support

[ysangkok]

Changes

• Adds a Hackage datasource to allow fetching releases Haskell packages on Hackage
• Adds a Cabal file parser, to allow extracting dependencies from .cabal files
• Adds a same-major-pvp variant, which is like same-major, but for PVP (where the B in A.B.C is also part of the major version)

Context

This is related to #8187, but the discussion talks mostly about dependencies
pinned with Git commits. This PR is about bumping version bounds of packages
released to Hackage.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

Since this is a new feature, I think it would make most sense to add it to documentation later.

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[secustor]

This needs a discussion first for the manager part and should be split up into separate PRs:

1. versioning
2. datasource
3. manager

[github-actions]

Please create a GitHub Discussion before continuing with this PR.

Thank you for your PR, but we need to discuss the requirements and implementation first.

The maintainers believe that there is a lack of - or misalignment of - requirements about this PR. We need to discuss the requirements and implementation first so that you don't write code that won't be merged.

This PR will be closed for now to avoid confusion, but you can reopen it after the discussion has been resolved.

Thanks, the Renovate team