[Replay Details] Add rrweb player to render gestures

[michellewzhang]

• we basically need to create a rrweb player alongside the video player
• the video events will keep going to video plugin and the other non-video events should go to rrweb (like web replays) -- in this case we should only have mouse interaction events, and no DOM
• though we may need to fake some events to get rrweb to work

implementation details:
const inst = new Replayer(...)
inside of videoReplayer.tsx in the constructor somewhere

a new interface that wraps the existing ones:

[michellewzhang]

PR is out but there are bugs with the rrweb gestures when seeking