Global Rate Limit - Githubissues

Story: Add a Global Rate Limit

As a moderator, I want to be able to add a rate limit to certain commands so that those commands cannot be spammed.

[x] Create some way to record what command a user runs, and when they ran it. This should be implemented globally, not on a per-guild basis.
[x] When a user executes the command, check if they are recorded for using that command.
[x] If they are, tell them they cannot use the command for X seconds.
[x] Automatically remove the user from the record when the rate limit expires for them.
[x] Apply your rate limit functionality to the cat and mock commands.