.ical Support for web & file connector

[415matt]

This feature would add support for indexing .ical files both static (via file connector) and dynamic, updating daily (via web connector).

Companies often publish org-wide calendars for meeting rooms, events etc. These calendars can be shared via .ical format as a url.

This feature would allow Danswer to answer event related queries such as

• "What times on Thursday is meeting room 2 booked?"
• "What meetings do I have scheduled on the 25th?"
• "What time is the staff retreat tomorrow?"

This shouldn't be a hard feature to implement, existing packages such as iCalendar exist to parse this format.

[415matt]

I'm planning on submitting a PR for this within the next 4-5 weeks