add asrTimeout to transcribe

specs.json

@@ -420,7 +420,8 @@
       "id": "string",
       "transcriptionHook": "string",
       "recognizer": "#recognizer",
-      "earlyMedia": "boolean"
+      "earlyMedia": "boolean",
+      "asrTimeout": "number"
     },
     "required": [
       "transcriptionHook"

test/jambonz-verb-test.js

@@ -269,6 +269,7 @@ test("validate correct verbs", async (t) => {
     {
       "verb": "transcribe",
       "transcriptionHook": "http://example.com/transcribe",
+      "asrTimeout": 10,
       "recognizer": {
         "vendor": "nvidia",
         "language" : "en-US",