Support structured mutations for well-known types.

[negz]

What problem are you facing?

#41 adds board support for creating, updating, and deleting Kubernetes resources via xgql. I believe this technically covers all our use cases and is in some cases the best we can really do - e.g. for types like XRs and managed resources where we don't know the full schema of the resource.

There are however some mutations for well known resources - e.g. installing a provider or a configuration - that will be common and where we do know the schema. It would be ideal if we had 'strongly typed'/'structured' mutations for these types.

How could xgql help solve your problem?

xgql could add structured mutations for well-known types, particularly creating and updating configurations, and providers. At some point we may also want to support working with XRDs and Compositions directly.