Mosaic tilling configuration

[arthurzenika]

In some cases it's nice to have a "speaker" full screen and all participants in small thumbnails like it is the case now for hublin. It would also be nice to be able to have a "mosaic" tilling scheme where all participants have an equal size on the screen.

For example for use cases such as https://tech.people-doc.com/welcome-to-the-virtual-open-space.html