Command handler should not create the same command twice via api call

[Exanlv]

Commands should not register again on a restart. THIS APPLIES ONLY FOR INTERACTION HANDLER

Command registration before READY event should be pooled on READY event it should:

• Retrieve set commands for GLOBAL and all GUILDS
• Check which commands have changes
• Update only changed
• Set listeners for non-changed based on ID retrieved
• This should also store the application ID somewhere in the Interaction Handler so registering commands later on in the application life cycle works

this functionality should be entirely stateless and should not use anything like the file system to store IDs etc

[Exanlv]

Story closed as an alternative has been made, see docs on application commands