Feature Request: URL collector

### Description

Conversations (rooms) in Riot currently have a way to list members of the conversations, notifications and files uploaded to the conversation. In line with this last feature, I think it would be very convenient to have a URL collector (aka URL grabber, URL snatcher, and other keywords others might use when searching the issues :wink:).

The idea is very simple: any link that is pasted to the conversation is collected by the URL collector and a new section next to "files" is shown: "links", that displays all the collected URLs.
Even in this simplistic version, it would already be very useful, as in ongoing and regular conversations, lost of links get shared and it is sometimes hard to go back to them.

A more advanced version would:
- display they date of the collected URLs
- organise them by week, month, year
- recognise protocols beyond HTTP and HTTPS like magnet links, IPFS or ZeroNet

For those who remember, this is a feature that Trillian, a multi-protocol IM client of the early noughties, had :slightly_smiling_face:

Lastly, I searched the issues for a similar feature request, to no avail.

In any case, hope this helps!