Muting: Allow time-based expirations on muted words/accounts

[bhammerslag]

Is your feature request related to a problem? Please describe.

I often want to mute a word, phrase or account not permanently, but just temporarily until some current event has passed. It's easy to forget a mute exists, so I have to either remember to unmute a term after a while or else mute it permanently. Sometimes I'm just tired of seeing a thing, but I don't want to mute that thing forever.

Describe the solution you'd like

The ability to mute a word/phrase/hashtag/user for some reasonable blocks of time (e.g. 1 day, 7 days, 30 days, 90 days).

Describe alternatives you've considered

N/A

Additional context

[surfdude29]

I think they're planning to do this, as this atproto PR adds an optional datetime field for when a mute expires 👀

[surfdude29]

The PR to add timed mutes to the app is #4801