Add GraphQL to V3 and V4 types

[mefellows]

See https://pact.canny.io/feature-requests/p/v3-support-for-graphql-interactions, and for some code snippets that could be pulled into the change.

Given how simple the code is (wrapper for the interaction type), I'm currently wary of adding it into the core code base and would like to consider the implications of doing so over a little further.

[TimothyJones]

My view is that adding it in is a strict improvement, as it makes the Pact-JS API consistent - where there's no difference between the V2 and V3/4 feature set.

My longer-term view is: for feature-parity with other languages, either neither graphql function should be in pact-js, OR the graphql wrapper should be in all the languages.

[mefellows]

Gist of how to do this here: https://gist.github.com/wabrit/2d1e1f9520aa133908f0a3716338e5ff

[JJ-Kamminga]

Is this still on the roadmap?
I'm currently looking into using Pact for my team. We use almost exclusively GraphQL, and at the moment it is a bit messy to get it to work. I would like to use V3, but a lot of the examples (TypeScript example, blog post about GraphQL in Pact) are about Pact (pre-V3). But the rest of the docs are about V3, so it doesn't seem that pre-V3 is generally encouraged/supported...

[mefellows]

It's just sugar on top of the HTTP API, so you don't need the graphql interface to achieve GraphQL Testing. We would happily accept a PR though.

This being said, it's generally safe to use the pre-V3 interface in this scenario.