Migrate Bulgaria holidays to holiday groups and categories

[KJhellico]

Proposed change

Migrate Bulgaria holidays to holiday groups and categories, add uk localization.

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency upgrade (version update)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• This PR is filed against beta branch of the repository
• This PR doesn't contain any merge conflicts and has clean commit history
• The code style looks good: make pre-commit
• All tests pass locally: make test, make tox (we strongly encourage adding tests to your code)
• The related documentation has been added/updated (check off the box for free if no updates is required)

[coveralls]

coverage: 100.0%. remained the same when pulling 6e4c197 on KJhellico:ref-bulgaria into c240d08 on dr-prodigy:beta.

[arkid15r]

🇧🇬 LGTM

The "Ден на народните будители" uk translation isn't ideal but I couldn't quickly come up w/ something better.

[KJhellico]

Yes, I couldn't find a better translation 🤷‍♂️