Add metadata2 module

[progval]

This is a fork of @k4bek4be's metadata module that implemented IRCv3 metadata, but this one implements IRCv3 draft/metadata-2.

[progval]

Hold on, I just realized that @k4bek4be's already implements the new spec. Let me sort this out.

[progval]

Got it, it doesn't. I got confused because it does implement draft/metadata-notify-2.

[k4bek4be]

I do already have a new version which is not yet included in this repo, implementing the new specification and fixing some small bugs. But it may not be up to the latest spec (last modified in 2023) and is largely untested. I think we should merge them both together.
Available here: https://github.com/pirc-pl/unrealircd-modules/blob/master/unreal6/metadata-2.c

[syzop]

It seems there was some quick with-48-hours activity and something about merging the two modules together but it has been silent since...

Has there been work on putting both changes together back in one module? If not, maybe you two can contact each other?
Or is there some reason not to follow that road.