Add Haiti holidays

[PPsyrius]

Proposed change

Add Haiti holidays (en_US, es, fr_HT, ht).

Closes #1199.

Note

There's a list that claimed to be "official" from 1999 for cross-checking purposes here. As it doesn't match with our 2 modern Haitian sources, I'll probably keep it for future cross-reference instead should we manage to dig up additional legal references to make this more complete.

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 update (version deprecation/pin/upgrade)
• 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
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e3d0a35) to head (c43d57c).
Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev     #1932   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          186       187    +1     
  Lines        11316     11367   +51     
  Branches      1789      1791    +2     
=========================================
+ Hits         11316     11367   +51     

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[KJhellico]

LGTM! 👍

[arkid15r]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud