Let Application to choose the Parser needed to parse rabbit payload (PR31)

[ainulhabib]

Expected behaviour: Applications using Rabbit Consumer can provide different parsers to parse Rabbit Payload Message . Parser type can be JSON or Plain Text

• Keep object RabbitMessage name based on data type it is holding (e.g. JSON, PLAIN,Throwable)

Actual behaviour:

Currently Rabbit Consumer is hardcoded to use JSON format only

• PR

Steps to reproduce behaviour: