request: Discord slash commands palette for bots support

[superusercode]

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

Sometimes I forget the exact format of a command. Discord has introduced slash commands to the / palette with the latest update, as described here from their last changelog:

Postulated new slash commands for bots. Performing actions with bots is easier than ever. Now, developers can have a list of commands available for their bots accessible by the slash key (/). You won’t have to remember bot commands anymore and get laughed at when you get the command wrong :( !help…..!help….please

Describe the solution you'd like

Implementation of the feature described here, with consideration for any limits of the functionality or use for specific commands only.

[superusercode]

New palette as-is:

[kyranet]

That's called slash command, it's in our roadmap to support them, but we don't have the facility to do so with version 5 (due to limitations with current Skyra Core and Klasa).

I will add this to the version 6 roadmap, as this and many other features will be possible since then.