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/Connexion/AdminMessagesService.ts

@@ -1,5 +1,5 @@
 import { Subject } from "rxjs";
-import type { BanUserMessage, SendUserMessage } from "../Messages/generated/messages_pb";
+import type { BanUserMessage, SendUserMessage } from "../Messages/ts-proto-generated/messages";
 
 export enum AdminMessageEventTypes {
     admin = "message",
@@ -26,8 +26,8 @@ class AdminMessagesService {
 
     onSendusermessage(message: SendUserMessage | BanUserMessage) {
         this._messageStream.next({
-            type: message.getType() as unknown as AdminMessageEventTypes,
-            text: message.getMessage(),
+            type: message.type as unknown as AdminMessageEventTypes,
+            text: message.message,
         });
     }
 }