add depractaion comments

Author: toger5

src/matrixrtc/EncryptionManager.ts

@@ -110,6 +110,7 @@ export class EncryptionManager implements IEncryptionManager {
         this.manageMediaKeys = this.joinConfig?.manageMediaKeys ?? this.manageMediaKeys;
 
         this.transport.on(KeyTransportEvents.ReceivedKeys, this.onNewKeyReceived);
+        // Deprecate RoomKeyTransport: this can get removed.
         if (this.transport instanceof RoomAndToDeviceTransport) {
             this.transport.on(RoomAndToDeviceEvents.EnabledTransportsChanged, this.onTransportChanged);
         }

src/matrixrtc/MatrixRTCSession.ts

@@ -401,6 +401,7 @@ export class MatrixRTCSession extends TypedEventEmitter<
                 this.logger.info("Using to-device with room fallback transport for encryption keys");
                 const [uId, dId] = [this.client.getUserId()!, this.client.getDeviceId()!];
                 const [room, client, statistics] = [this.roomSubset, this.client, this.statistics];
+                // Deprecate RoomKeyTransport: only ToDeviceKeyTransport is needed once deprecated
                 const roomKeyTransport = new RoomKeyTransport(room, client, statistics);
                 const toDeviceTransport = new ToDeviceKeyTransport(uId, dId, room.roomId, client, statistics);
                 transport = new RoomAndToDeviceTransport(toDeviceTransport, roomKeyTransport, this.logger);

src/matrixrtc/RoomAndToDeviceKeyTransport.ts

@@ -21,6 +21,7 @@ import type { RoomKeyTransport } from "./RoomKeyTransport.ts";
 import type { ToDeviceKeyTransport } from "./ToDeviceKeyTransport.ts";
 import { TypedEventEmitter } from "../models/typed-event-emitter.ts";
 
+// Deprecate RoomAndToDeviceTransport: This whole class is only a stop gap until we remove RoomKeyTransport.
 export interface EnabledTransports {
     toDevice: boolean;
     room: boolean;