Support for multiple streams under same peer connection

[OOOllie]

Component your feature request relates to

• Signalling server
• Frontend library
• Frontend UI library

Problem your feature solves? Please describe.
Having to create multiple tabs to receive multiple video streams is not efficient. User should be allowed to configure multiple streams of data in the same browser tab.

Describe the solution you'd like
Enable customizability to allow one player to subscribe to multiple streams at once over the same peer connection.

Additional context
This may require modification to the Pixel Streaming Plugin. I've been searching for a solution to add multiple Streamer instances to a player but I cannot find this.

[lukehb]

Having multiple video streams from the same peer connection would indeed require a modification to the Pixel Streaming plugin. The specific modification would be to support multiple video tracks to be added to each streamer/peer connection on the UE side.

While feasible, this is not on our roadmap at all. We would be willing to accept a PR on the Unreal Engine repo potentially, but this not something we are focusing on supporting any time soon.