Emoji double-check confirmation before moderation actions.

[ShadowJonathan]

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

When operating mjolnir, and using text-based commands, its often easy to mistype or make mistakes, which then have to be corrected after the fact.

These mistakes can range from a single typo ("sapm") to destructive actions (banning @spambot* :matrix.org. where the bot interprets :matrix.org as the "reason")

Describe the solution you'd like

Have an opt-in configuration where the bot repeats the command back to you in plain english, "You want me to ban @abcd:efgh, who is currently in 8 protected rooms?", and then allow the user to press ✅ or ❌ on that message, to confirm or deny the command.