Simplify interface for getting user response from template

[freddidierRTE]

Today to define the user response opfab uses a register method to get data from the template

The structure of the response is :

{
valid: boolean
errorMessage: string
responseCardData: the data field of the child card
actions: The actions field value for the response card. This field is optional.
responseState: The state field value for the response card. This field is optional (default value is defined in the state process definition).
publisher: The publisher field value for the response card. This field is optional (default value is the first current user entity that is allowed to respond).
}

To ease the use and understanding of the API , it should now be

{
valid: boolean
errorMessage: string
responseCard:
     data : the data field of the child card
     actions: The actions field value for the response card. This field is optional.
     state: The state field value for the response card. This field is optional (default value is defined in the state process definition).
     publisher: The publisher field value for the response card. This field is optional (default value is the first current user entity that is allowed to respond).
}

Old structure will still be useable but deprecated