Added sendDataOnlyOnChange parameter for MQTT Connector

[samson0v]

No description provided.

[devaskim]

@imbeacon First of all thanks for your quick response. It is important for community!

I suggest or I meant to support more granular filtering. Here is example:
Message 1:

{
    "Param1": 1
    "Param2": 50
}

Output 1:

{
    "Param1": 1
    "Param2": 50
}

Message 2:

{
    "Param1": 1
    "Param2": 100
}

Output 2:

{
    "Param2": 100
}

[devaskim]

@samson0v Sounds not polite, I know, but if your team will approve #1000, I suggest to cancel changes of this PR, because my implementation is based on sendDataOnlyOnChange in converter configuration as well.

Hope for your understanding