Create `channel_manager` extension for channel management

[Mega-JC]

Target Issue(s)

No response

Overview

I propose the creation of a channel management bot extension called channel_manager, to ease bulk channel management.

Synopsis

There are cases where bot commands for managing Discord server channels in bulk would come in handy, either for efficiency or to bypass Discord client bugs.

Technical Information

This would solely consist of Discord API code. It's nothing fancy and doesn't need db access.

New Bot Commands

• channel clone : Add channel_manager extension with initial channel clone command #26
  Clones channels of all kinds, including entire channel categories at once.
• channel permissions [get]: Retrieves the permissions of a specified channel visually and as JSON.
• channel permissions set: Sets the permissions of the specified channel (category) from a JSON representation, either partially or as an overwrite.
• channel move: Moves a channel (category) to the speficied category and/or position.
• channel delete: Deletes the specified channel or channel category.

Changed Bot Commands

No response