add initial support for nuance stt

lib/jambonz/specs.json

@@ -432,7 +432,7 @@
     "properties": {
       "vendor": {
         "type": "string",
-        "enum": ["google", "aws", "microsoft", "default"]
+        "enum": ["google", "aws", "microsoft", "nuance", "default"]
       },
       "language": "string",
       "vad": "#vad",
@@ -495,12 +495,53 @@
       "initialSpeechTimeoutMs": "number",
       "azureServiceEndpoint": "string",
       "asrDtmfTerminationDigit": "string",
-      "asrTimeout": "number"
+      "asrTimeout": "number",
+      "nuanceOptions": "#nuanceOptions"
     },
     "required": [
       "vendor"
     ]
   },
+  "nuanceOptions": {
+    "properties": {
+      "clientId": "string",
+      "secret": "string",
+      "topic": "string",
+      "utteranceDetectionMode": {
+        "type": "string",
+        "enum": [
+          "single",
+          "multiple",
+          "disabled"
+        ]
+      },
+      "punctuation": "boolean",
+      "profanityFilter": "boolean",
+      "includeTokenization": "boolean",
+      "discardSpeakerAdaptation": "boolean",
+      "suppressCallRecording": "boolean",
+      "maskLoadFailures": "boolean",
+      "suppressInitialCapitalization": "boolean",
+      "allowZeroBaseLmWeight": "boolean",
+      "filterWakeupWord": "boolean",
+      "resultType": {
+        "type": "string",
+        "enum": [
+          "final",
+          "partial",
+          "immutable_partial"
+        ]
+      },
+      "noInputTimeoutMs": "number",
+      "recognitionTimeoutMs": "number",
+      "utteranceEndSilenceMs": "number",
+      "maxHypotheses": "number",
+      "speechDomain": "string",
+      "formatting": "string"
+    },
+    "required": [
+    ]
+  },
   "lexIntent": {
     "properties": {
       "name": "string",