[WIP] Exploring positional arguments

[captbaritone]

TODO

• Handle context arg
  • Allow user to tag context type
• Handle Info arg
  • Should Grats export an alias of the type for Graphql-js?
  • Can we use merging to add our tag to the type?
  • Can we detect the type from GraphQL-js?
• Support for renamed methods
• Support for function fields
• Documentation

Fixes #23

[netlify]

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