Migrating front protobuf encode/decode to ts-proto lib

The ts-proto lib has the huge advantage of producing code the "Typescript" way and not the "Java" way.
In particular, for "oneof" types in protobuf, it is generating "ADT" that can be used to check if we forgot or not to deal with a type.

front/src/WebRtc/SimplePeer.ts

@@ -75,23 +75,25 @@ export class SimplePeer {
      */
     private initialise() {
         //receive signal by gemer
-        this.Connection.receiveWebrtcSignal((message: WebRtcSignalReceivedMessageInterface) => {
+        this.Connection.webRtcSignalToClientMessageStream.subscribe((message: WebRtcSignalReceivedMessageInterface) => {
             this.receiveWebrtcSignal(message);
         });
 
         //receive signal by gemer
-        this.Connection.receiveWebrtcScreenSharingSignal((message: WebRtcSignalReceivedMessageInterface) => {
-            this.receiveWebrtcScreenSharingSignal(message);
-        });
+        this.Connection.webRtcScreenSharingSignalToClientMessageStream.subscribe(
+            (message: WebRtcSignalReceivedMessageInterface) => {
+                this.receiveWebrtcScreenSharingSignal(message);
+            }
+        );
 
         mediaManager.showGameOverlay();
 
         //receive message start
-        this.Connection.receiveWebrtcStart((message: UserSimplePeerInterface) => {
+        this.Connection.webRtcStartMessageStream.subscribe((message: UserSimplePeerInterface) => {
             this.receiveWebrtcStart(message);
         });
 
-        this.Connection.disconnectMessage((data: WebRtcDisconnectMessageInterface): void => {
+        this.Connection.webRtcDisconnectMessageStream.subscribe((data: WebRtcDisconnectMessageInterface): void => {
             this.closeConnection(data.userId);
         });
     }