[Feature Request]: Setting for LiveCanvas to prevent local user from sending signals / making ops

[ryanbliss]

Describe your user scenario

For large meetings / connection volume, it is important to have a small amount of clients that can send outgoing signals when possible. so that developers can implement a "presenter only" state, where only the cursors / strokes of active presenter(s) would be visible.

Describe the solution you'd like

We should follow the pattern from LiveMediaSession and our other open issues to put in a canSendCursorUpdates and canSendInkingUpdates. Since LiveCanvas does not use LiveObjectSynchronizer, these settings likely must be within the DDS itself.