Create an XMPP interface for querying relay/bridge details

This interface would respond to user requests returning Atlas URLs and basic information from Onionoo on the relay, or provide basic aggregated data that may be useful.

The exact commands that may be used are still needing to be defined.

The underlying XMPP framework may be more useful when it comes to providing direct notifications later.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information