Temp channel command

[nova-nybbles]

Add a command to temporarily create a private channel for topical conversations.
Command:
tempchannel (text|voice) <channel name> <#>(minutes|hours|days)

This will:

1. Create a new role
2. Create a new channel where only users with that role may see/join
3. Create a new message in the channel where command was used with instructions
4. Add a reaction that anyone may use to get the role to see the channel
5. Add a reaction that the owner may use to delete the channel+role early

Other requirements:

• Shouldn't exceed more than 7 days
• Should still cleanup on bot restart (so needs to reset the timers from persistent cache)
• Error messaging

Optional/Other questions:

• Should the channel be archived instead of removed?
• Create a channel folder named Temp exclusively for these channels
• Option for admin to react with 3rd option to keep channel permanently
• Activity based? I.e. Will delete if channel is unused for x time period?
• Max channels per user? 3?