Supports Graphback generation

[eric-burel]

Is your feature request related to a problem? Please describe.
Graphback is an interesting tool to generate graphql API.
https://graphback.dev/

Describe the solution you'd like

Being able to convert a Vulcan schema into a graphback model.
We would simply need to generate the relevant graphql model.
Then the resolvers are generated by Graphback.

And maybe the other way around, being able to generate a Vulcan backend from a Graphback declaration.

Describe alternatives you've considered
Graphback would replace our own resolvers and API. It should be seen as a compatible but alternative option to Vulcan Fire