Find the holidays observed in a particular country

# Holidays Service

List holidays observed in a country. Holidays may be at the country or region level.   

Holiday types are:
- Public - public holiday 
- Bank - banks and offices are closed
- School - schools are closed
- Authorities - Government or other authorities are closed
- Optional - A day where a majority of people take the day off
- Observance - Optional day off, typically unpaid

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