Feat/ambient sounds (#678)

* initial support for coaching mode in conference

* wip

* wip

* add support for answer verb

* wip

* wip

* wip

* wip

* wip

* updates to rename option to dub

* wip

* wip

* wip

* update verb-specs

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* add option to boost audio signal in main channel

* wip

* wip

* wip

* wip

* wip

* wip

* for now, bypass use of streaming apis when generating tts audio for dub tracks

* add nested dub to dial

* wip

* add support for filler noise

* kill filler noise when gather killed

* wip

* wip

* while using sayOnTrack, we have to enclose the say command in double quotes

* disableTtsStreaming = false

* allow transcribe of b leg only on dial verb

* dub.say can either be text or object like say verb with text and synthesizer

* remove loop for sayOnTrack

* update speech-utils

* fixes for testing transcribe verb and support for dub and boostAudioSignal in lcc commands

* add dial.boostAudioSignal

* fix bug where session-level recognizer settings incorrectly overwrite verb-level settings

* update verb specs

* update dial to support array of dub verbs

* fix bug setting gain

* lint

* wip

* update speech-utils

* use new endpoint methods for mod_dub

---------

Co-authored-by: Dave Horton <daveh@beachdognet.com>

lib/tasks/make_task.js

@@ -14,6 +14,9 @@ function makeTask(logger, obj, parent) {
   }
   validateVerb(name, data, logger);
   switch (name) {
+    case TaskName.Answer:
+      const TaskAnswer = require('./answer');
+      return new TaskAnswer(logger, data, parent);
     case TaskName.SipDecline:
       const TaskSipDecline = require('./sip_decline');
       return new TaskSipDecline(logger, data, parent);
@@ -41,6 +44,9 @@ function makeTask(logger, obj, parent) {
     case TaskName.Dtmf:
       const TaskDtmf = require('./dtmf');
       return new TaskDtmf(logger, data, parent);
+    case TaskName.Dub:
+      const TaskDub = require('./dub');
+      return new TaskDub(logger, data, parent);
     case TaskName.Enqueue:
       const TaskEnqueue = require('./enqueue');
       return new TaskEnqueue(logger, data, parent);