Mock Command - Githubissues

Story: Add a Mock Command

As a user, I want the bot to know who should be mocked so that it can later "mock" said user when they send a message.

[x] Create the slash command with name mock that takes a single argument, the user to mock.
[x] When the command is executed, ensure the user is not a bot or the user who sent the command.
[x] Record the user who should be mocked somewhere (e.g., a global set).
[x] Ensure the command cannot be used in DMs (it can be as simple as checking if the command was executed in a guild and, if so, tell them).