Slash Commands: Add date selector option

[Nirlep5252]

For bots like birthday bots or for mod commands like /purge if a user wants to purge between/before/after a specific date/time a selector option thing would be pretty useful 🤔

[AlmostSuspense]

That's a duplicate of

• Date argument type for slash commands #3303

[Nirlep5252]

Sad ;-; I was too late