Add option to enable to-device-encryption (#3167)

* enable to-device-encryption

* add logging for key provider

* make rooms encrypted

* add dev setting to choose to-device or room encryption

* add indicator when to-device is used.

src/rtcSessionHelpers.test.ts

@@ -112,6 +112,7 @@ test("It joins the correct Session", async () => {
       manageMediaKeys: false,
       useLegacyMemberEvents: false,
       useNewMembershipManager: true,
+      useExperimentalToDeviceTransport: false,
     },
   );
 });