Add REST API as a feature

[samialfattani]

I think it is ver cool that a user can expose the ModelView to be used by REST API requests including all CRUD operations. We can add extra attributes such as api_can_read, api_can_create, api_can_edit, api_can_delete to the ModelView. However We should think about some details as follows:

• Data should be submitted in JSON format then it is internally converted into Form and submitted to the current endpoints such as /edit, /action, /new ...etc.
• Response should be retrived in JSON including flash messages and errors.
• Data Validation should be responsible by same WTF validators that used currently.
• Enable our users to override thier own functionlity to check the requeust's Authentication and Authorization.
• All events such as on_model_change, after_model_change...etc should be also working with REST API in the same manner.

Happy to hear feedback from you.

[samuelhwilliams]

This feels like it goes beyond the scope of Flask-Admin. I don't think we should try to support this.