[Development] Update Response Model

[TanmoySG]

Currently the response has following field

{
    "action": "listRole",
    "status": "success",
    "error": {},
    "data": {}
}

The data field is misleading as response can be anything - database, collection, role, message, etc. This data field may also be confused with data/datum entity.

So to make it less confusing,

• Update the API response with a response field that would take all the values that data does
• To ensure backward compatibility, the data field would NOT be removed immediately , but the response would have both the data and response fields returning the same data.
• The data field would be phased out at some point in future [ #121 ]
• Maybe add a (generic) notice field in response for deprecation warning. This field can be used for other purposes too. [ #122 ]

{
    "action": "listRole",
    "status": "success",
    "error": {},
    "data": {},
    "response" : {}
}