Add mutation support for schema editing

[bigfish24]

This should be limited to admin users but should support:

1. Creating new classes
2. Added new properties to a class (additive only for synced Realms)

[nirinchev]

Similarly to the create/delete api, I think this would be better off as a regular REST API - there's no apparent benefit from using GraphQL for it. Or am I missing a use case?

[bigfish24]

Yeah that's true, I guess I am coming at it from the original desire to have the requirements on the data access APIs, of which this GraphQL API subsumed that work. Having a coherent client API experience would be nice.

[kraenhansen]

Was this fixed or what seems to be the best work-around for now?

[kraenhansen]

On the discussion of REST vs GraphQL I would say its simpler to have a single way of accessing and mutating data, so if there is no technical limitiation to having it all be GraphQL based it would most probably simplify the interface from an API consumers point of view.

[nirinchev]

No, this was never prioritized.