Relay and Django filter support for pages and snippets

[ghost]

refer: https://docs.graphene-python.org/projects/django/en/latest/tutorial-relay/

[dopry]

@praveenwissend

I'm not totally in love with relay support for the following reasons.

• the nodes/edges are annoying verbose
• the pagination features are generally difficult to work with and missing total counts
• its kind of counter to the simplified schema current provided by wagtail grapple, and is potentially a lot of work to implement in parallel or is a major breaking change for current users if implemented as a standard to replace the current schema.

Can you describe a little more about what you're looking for with relay support or why you think it would be a good choice? Is there something in particular you need or are trying to do?