Add command to query list of users behind the bridge

[Wuzzy2]

Is your feature request related to a problem? Please describe.
As an IRC user, I see myself unable to see who is behind the bridge. All I see is the bridge user itself, but that's it.

Describe the solution you'd like
Add support for a special bot command that, when sent to the bot, replies with a list of all people behind the bridge, and maybe also what system they use.

To avoid polluting the chat, make the bot only accept /msg messages.

Describe alternatives you've considered
None.

Additional context
None.

[qaisjp]

If accepted, I am happy to provide a pull request to implement this [for Hacktoberfest 😉]

[42wim]

This should be part of the larger feature #191
I've worked a bit on this in fb713ed but had to revert because of issues with large channels.

@qaisjp sorry for the delay, I didn't have much time this month :(

[qaisjp]

That's okay :)

[42wim]

Duplicate of #191