Proposal: Basic Reference spec test suite

[StevenACoffman]

When maintaining a Go programming language parser for GraphQL, I have found it quite useful to run the reference JavaScript implementation tests against my Go parser implementation see here. Sometimes the specification wording was unclear, but the test suite made it unambiguous.

I suggest that for this specification, that there be a similarly maintained basic reference test suite such that implementations (and programming languages) can differ in implementation but remain consistent in all other ways.

Several recent issues would be resolved by clarity over the spec's required algorithms or heuristics that a test suite would provide.