[FR] Filter tags in calander

[Artemis1-0]

Description

Have an option to only show events with specific tags in the calendar, similar to the filter option in grid and board.

Impact

All users

Additional Context

I would like to help on this issue but due to personal reasons I can't devote any time to learning the appflowy conventions and how to submit pull requests and all of the things required to do a code submission. Also, I'm not familiar with Flutter or any of the languages or api's used with appflowy as I am still quite a novice at programming so any description how you did this would be greatly appreciated. I may be able to submit my first pull request this summer

[Artemis1-0]

@factotvm

[Artemis1-0]

@annieappflowy