Native cooldown implementation for slash commands

[kingmigdor]

There are lots of bots having cooldowns on commands that are likely annoying users when they invoked a command without knowing what the cooldown actually is. So I thought about an implementation (when slash permissions arrive) to have an implemented cooldown option for running a specific command. This could also be done with other interactions: When a bot received an Interaction like from a button / context-menu or whatever, it could be able to create a response with a new cooldown the user/role/channel/server gets.
I don't think that a registered cooldown would make much sense for some bots as there are some bots having dynamic cooldowns, or some bots allow commands to get run x times by y members and then getting a cooldown. The command or button can have a clock icon next to it showing the cooldown, and the command/component/context-menu could be grayed out like when they are disabled.

[RedDaedalus]

Duplicate of #3870