Idea: add ability to output GraphQL DocumentNode instead of function call + graphql string

[illusionalsagacity]

In the same vein as babel-plugin-graphql-tag, graphql-ppx could output a GraphQL DocumentNode.

In my mind, this has a few benefits:

• Eliminates the runtime bundle download and execution cost of including graphql, while not the largest dependency out there, is non-zero at 166.1 kB minified and 39.7kB minified + gzipped
• Should have faster module evaluation if outputting var documentNode = JSON.parse("<minified_ast>")