Add support for admin approval before series/movie is added

[toddrob99]

Perhaps send an approval message with accept/deny buttons to all admins when a non-admin submits a request. Will need to handle updating/removing requests sent to other admins when one completes the request.

Or add an admin command to manage requests similar to how users are managed, and send a message to admins that prompts them to start the request management flow. May still need to send a message indicating the request was completed.

Or add support for an admin group where individual requests can be posted in a single location and accepted/denied by any admin in the group.

Suggested by @wesd84 on Telegram

[toddrob99]

Also requested by @zacrobertson on Telegram

[mritunjaymusale]

+1 please integrate this feature