[Tickets] Working Hours Feature

[StormyGalaxy]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
I would like to be able to add working hours to ticket panels which can be configured to allowed/not allow users to open a ticket when not in working hours. Additionally, if a ticket is created outside of the working hours, the bot can send a configurable embed alerting the user that times may be delayed (see images)

Describe alternatives you've considered
I could use the FIFO cog, but I can't think of a way for it to just send an embed in ticket channels.

Additional context
Another image of a bot using this feature:


If you need anything else from me to make this possible, please don't hesitate to reach out.