• Updated LocalParticipant.PublishData() to send PublishDataOptions as a structured JSON, including topic, destinationIdentities, and reliable flags.
• Fix C# event handler for RoomEvent.DataReceived to correctly extract and forward the topic and DataPacketKind parameters from the JS stack.
• Ensures parity between WebGL and native LiveKit SDK behavior for data messages.

Previously, the WebGL build was unable to send or receive the topic associated with a data packet, as the bridge did not forward it and read it properly. This caused topic-based message handling to fail silently in WebGL builds.

Manual testing has been performed:

• Send/receive between WebGL - WebGL and WebGL - native clients (bidirectional);
• Topic defined/undefined — verified that the topic and other args are correctly propagated to receiving clients;