Add a reaction clean command

[bast0006]

https://discord.com/channels/267624335836053506/291284109232308226/822218898693685248 is a good example for use cases where we may want to purge reactions on many messages in a channel. I don't think discord lets us remove reactions from a given user, but they do permit us to remove a specific reaction from a specific message.

I imagine usage similar to

!reactionclean [messages] [reaction1] [reaction2] [reaction3]

and

!rclean 10 pensive rofl clown

We should probably have a "hard-coded" max to the number of messages that is specifiable to prevent the bot from accidentally traversing too far back.

[Shivansh-007]

I would like to work on this!

[Shivansh-007]

I'm unassigning myself. The issue is waiting for #1527 to be merged and can then be worked on, I'm not sure how soon I'll have time.

[jb3]

Closed in 2025 review of open issues. We do not feel there is a large need for this feature.