Proposed change

Introduce workdays related calculation support in Python Holidays. Add following public methods to HolidayBase:

• is_workday(dt) - check if date is a working day
• get_nth_workday(dt, n) - return n-th working day from date
• get_workdays_number(dt1, dt2) - return the number of working days between two dates

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/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