Response file validator

[brunohjs]

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Is your feature request related to a problem? Please describe.
Create a response file validator to check little errors that the Rasa don't see, like a extra " or } in a button payload:

• /my_intent{""my_entity": "my_value"}
• /my_intent{"my_entity": "my_value"}}

Also, it could check case in intents or entities in a button payload:

• /My_intent
• /my_Intent

And other checks.