feat: allow using existing jwt

src/client.ts

@@ -39,6 +39,7 @@ export interface ClientOptions {
   email?: string;
   password?: string;
   privateKey?: Uint8Array;
+  jwt?: string;
 }
 
 interface FetchOptions {
@@ -62,6 +63,10 @@ export class Client {
       throw new Error("Portal url is required");
     }
 
+    if (options.jwt) {
+      this.jwtSessionKey = options.jwt;
+    }
+
     this._options = options;
   }