Speech recognition mode for azure speech-to-text

[rammohan-y]

Need provision to set azure's speech recognition mode. For this we need to do the following:

a. In verb-specifications provide azureOptions.speechRecognitionMode property, this property is defined as string with allowed values as CONVERSATION, DICTATION and INTERACTIVE

b. If property is specified in azureOptions, send the value of the property as a channel variable (AZURE_RECOGNITION_MODE) to freeswitch azure module from feature-server

c. In freeswitch mod_azure_transcribe module, read AZURE_RECOGNITION_MODE property value and if the property value is set, configure it to be sent to azure for speech-to-text