[IMP] add sequence to the valid SessionInfo keys

Sequence is a new property of RTCSessions[1]  which is used to
determine the order of connections to avoid race conditions in
"multi-network" (SFU/P2P hybrid) cases.

[1]: odoo/odoo#205198

Author: ThanhDodeurOdoo

src/models/session.js

@@ -17,6 +17,7 @@ import {
  * @property {boolean} isSelfMuted
  * @property {boolean} isDeaf
  * @property {boolean} isRaisingHand
+ * @property {number} sequence
  */
 
 /**
@@ -80,6 +81,7 @@ export class Session extends EventEmitter {
         isDeaf: undefined,
         isCameraOn: undefined,
         isScreenSharingOn: undefined,
+        sequence: undefined,
     });
     /** @type {string} */
     remote;