[Permissions] Support Permission Requirements To Execute Command

[Skillz4Killz]

Hello 👋

Problem: Users try to use certain commands but don't realize they lack the necessary permissions to do it or that the bot lacks the permissions to do it.

Request:

{
  invoker_permissions: "8",
  bot_permissions: "4",
  bot_channel_permissions: {
    "1234 channel id": "280640",
  }
}

• The user(invoker) of the command needs x permissions to use the command.
• The bot requires Y permissions to use the command.
• The bot requires z permissions on xx channel

[ckohen]

This isn't feasible to implement on the command structure as the list of channels that you need x permissions in will undoubtably change every time, and it is an ever growing list. If discord ever adds an error response type, then maybe missing permissions can be a reason with this payload