Feature/nvidia speech (#261)

* initial changes for nvidia speech

* allow nvidia speech credentials to be set at runtime

* update drachtio-fsmrf

* fix handling of nvidia-specific options

* fix nvidia custom config

* fix nvidia word time offsets

* fix nvidia custom configuration

* normalize nvidia transcripts

* update to @jambonz/realtime-dbhelpers with nvidia tts support

lib/tasks/specs.json

@@ -467,7 +467,7 @@
     "properties": {
       "vendor": {
         "type": "string",
-        "enum": ["google", "aws", "polly", "microsoft", "nuance", "ibm", "default"]
+        "enum": ["google", "aws", "polly", "microsoft", "nuance", "ibm", "nvidia", "default"]
       },
       "language": "string",
       "voice": "string",
@@ -488,7 +488,7 @@
     "properties": {
       "vendor": {
         "type": "string",
-        "enum": ["google", "aws", "microsoft", "nuance", "deepgram", "ibm", "default"]
+        "enum": ["google", "aws", "microsoft", "nuance", "deepgram", "ibm", "nvidia", "default"]
       },
       "language": "string",
       "vad": "#vad",
@@ -555,12 +555,26 @@
       "asrTimeout": "number",
       "nuanceOptions": "#nuanceOptions",
       "deepgramOptions": "#deepgramOptions",
-      "ibmOptions": "#ibmOptions"
+      "ibmOptions": "#ibmOptions",
+      "nvidiaOptions": "#nvidiaOptions"
     },
     "required": [
       "vendor"
     ]
   },
+  "nvidiaOptions": {
+    "properties": {
+      "rivaUri": "string",
+      "maxAlternatives": "number",
+      "profanityFilter": "boolean",
+      "punctuation": "boolean",
+      "wordTimeOffsets": "boolean",
+      "verbatimTranscripts": "boolean",
+      "customConfiguration": "object"
+    },
+    "required": [
+    ]
+  },
   "ibmOptions": {
     "properties": {
       "sttApiKey": "string",