Feature request: API rate limits settings

[terion-name]

When dealing with bots (third-party or self-developed) one may often occur problems with very strict api rate limits. Bots usually need to be able to perform more operations.

Admin API has this: https://github.com/matrix-org/synapse/blob/develop/docs/admin_api/user_admin_api.md#override-ratelimiting-for-users

Admin interface — lacks

[BurnyBoi]

Just needed to modify this today. Definitely would be useful to have easier access to this

[alexh-swdev]

This would be great indeed.