Suppot for Local Calendar entities

[upamanyudas]

FEATURE REQUEST: Have been using this for couple of months now. Great to have access to the holidays. It would be great to have a full local calendar created from the list of holidays (similar to what https://github.com/mampfes/hacs_waste_collection_schedule does). This will make the integration infinitely more powerful in my opinion. We could do automations like if today = holiday (i.e. the calendar is on) then do not do certain things. What are you thoughts @pinkywafer