Direct p2p transfer files via WebRTC without storing on server

Very often people use messenger for transfer files, and most of servers limits the file size for save server space, so there are no ways to transfer large files.

But if we can do direct p2p video calls - why we can't transfer files via same way?

So will be good to have file transfer feature in Riot via WebRTC technology, here is example of file transfer process: https://webrtc.github.io/samples/src/content/datachannel/filetransfer/

And we can auto-suggest this mode of file transfer, if user try to upload file larger than Matrix server limit.