[WIP] Fix trace_with deprecation warnings

[loadkpi]

• Trying to fix Deprecation warning of schema.instrument, need to refactor to use .trace_with instead #8 by using the new tracing API for graphql-ruby.
• Keep the backward compability
• Added CI support for GraphQL 2.3, 2.4, 2.5

@Envek there's some code duplication between the new and legacy implementations. What is you opinion: should I DRY this up by extracting shared methods, or keep the implementations separate for simplicity?

[numbata]

@Envek is there a way to move this forward toward a release somehow?

[Envek]

@loadkpi, thank you very much for your pull request and sorry for the long wait!

I think that there is much value in keeping the old implementation at all. Let's drop all legacy stuff and version checks and instead bump minimum graphql-ruby version requirement to 2.0 (that's where current Tracing API appeared if I'm right)

For yabeda-graphql users it should be completely unnoticeable as all changes are hidden behind use Yabeda::GraphQL hook.