Add widget override capability for json

[llybin]

I want to specify a widget for displaying json_value. https://github.com/jmrivas86/django-json-widget

It would be convenient to configure widgets for each type or automatically use django-json-widget if it's installed.

[fabiocaccamo]

@llybin I would not overcomplicate the solution, using django-json-widget if installed sounds a good idea to me, would you want to submit a PR?

[llybin]

Hello, @fabiocaccamo sorry, at the moment this task is not a priority, and I can’t give a timeline for when we’ll get to it

[llybin]

I created a task on our board, within the priorities