Matrix Gateway: more useful names

[erebion]

Before creating a ticket, please consider if this should fit the discussion forum better.

Is your feature request related to a problem? Please describe.

I have contact to a lot of Matrix users with random Matrix IDs:

@kl6sdyhnv:example.org

This makes it quite hard to know who is saying what.

Describe the solution you'd like

Perhaps the name could instead be set following this scheme:

John Doe (@kl6sdyhnv:example.org)

This would make it far easier to follow chats with people in it that have random IDs.

Describe alternatives you've considered

I'm not aware of other ways this could be solved, but if there are others, I'd be fine with alternative solutions.

Additional context