Replace matterbridge matrix to mautrix

[xelab04]

This replaces the go-matrix based library with mautrix. It rewrites a lot of components from the matrix folder.
Full disclaimer, I did use a bit of AI to get around as I'm not normally a GO developer.

If there's anything wrong, I'd be happy to fix it!

[poVoq]

We rencently started a community maintained fork here: https://github.com/matterbridge-org/matterbridge

Your contribution would be highly appreciated.

Did you look at the pre-existing work to use mautrix and user puppeteering via appservice?

[xelab04]

Hi. Thank you, I'll give it a look.
I didn't look too deep into user puppeteering, I mainly just swapped out the matrix library. Thankfully quite a bit just worked but I'll have to give it a deeper look.

Actually, I have a community on Telegram and I wanted to bridge to Matrix, and so I did this out of need 😆

Right now, this is what the sync on matrix looks like

[poVoq]

Ah, there was a username spoofing PR for that before, but Matrix users strongly objected to it as being too heavy on server resources and also incompatible with some clients, see discussion here: 42wim#1875

The "proper" way of doing it was created as a PoC here: 42wim#1864 but in my tests it was buggy and didn't work with multiple channels yet, before the original dev abandoned it. But I think this would be worth investigating and you could make a second PR on top of this one to implement this as well.

[xelab04]

Alright, thank you @poVoq . I guess I can redo this PR on the main community fork?
I would be open to helping out with the project, particularly on the Matrix side of things.

[poVoq]

Great, you are very welcome to do so. Just try to make it into seperate PRs so that it can be merged more easily.

[poVoq]

Any news here? It would be great if you could make a new PR on the matterbridge-org repo.

Note: it would be great if you could explain a bit better what you used AI for exactly though.