Parse messages as json and push to message bus

Provides json messaging functionality between Kit and the web client using generic messaging such as omni.kit.gfn or omni.kit.livestream.webrtc.

It takes a message bus event of event_type omni.kit.livestream.receive_message and payload {"event_type": "SetColor", "payload": { ... }} and parses the payload as json and pushes a new event on the bus with event_type SetColor and the payload unpacked to the event payload dictionary.

It also provids an API to register custom event types to listen to for sending to the client using the generic omni.kit.livestream.send_message event type.

import omni.kit.livestream.messaging as messaging
messaging.register_event_type_to_send("SetColor")