feat: Explore using GraphQL Ruby's client directives

[daemonsy]

GraphQL Ruby has support for client directives now. It could potentially reduce the surface area of this library by quite a bit.

We have quite a bit code that seems to be responsible for generating the SDL.

[flvrone]

Hey @daemonsy! 👋
How about just adding the support for directives, without thinning out the gem's codebase for now? :)
I assume it should be simple. 🤔

[daemonsy]

Yea that was what I was thinking in my spike. We could detect that native directives are supported and call a branch of code.

It wasn't hard, it just produced slightly different results (e.g. definitions of the directives itself) that caused the tests to fail.

I think the old code can be removed when GraphQL 1.13.x and 2.0.x are the dominant versions.