Feature request: support for alternative url schemes

There are a lots of protocols and URL schemes and a lot of them may appear in the future. Some of the less often used and recognized are: gemini, gopher, finger, ftps, sftp, ssh, tel. These are not recognized by Element and so does not turn into highlighted, clickable links when appeared in chat.

I suggest to instead of adding support for more link types, treat all strings matching regex like `[-\w]+://\S+` as an URL, because it's hard to track all that niche URL schemes.