Use of Token as Password for MQTT connection

[amitjoy]

Is your feature request related to a problem? Please describe.
Most of the times people don't use hardcoded MQTT password whereas people tend to use authentication tokens, that's why, we should support retrieving tokens and using them as password as well.

Describe the solution you'd like
It would be beneficial to have a extra input to the MQTT connection dialog to enter the token configuration which the application will use to retrieve token and use it as password for the communication.

Describe alternatives you've considered
Use POSTMAN to retrieve the token manually and use it

Additional context
NA

[amitjoy]

For this, we would need to introduce predefined JSON formats for request and response:

Request JSON:

{
"authServerURL": "",
"clientId": "",
"clientSecret": "",
"audience": "",
"scope": "",
}

Response JSON:

{
"access_token": "",
"expires_in": 10
}