Enhancement/graphql custom resolvers and typedefs

[thescientist13]

Related Issue

resolves #508

Summary of Changes

1. Added the ability for users to provide a schema (defs / resolvers) in a directory called {workspace}/data/schema/

Found a bug in #573 that will prevent the formal demo here from working with build until it is merged since I am using a second inline <script> but the this PR does work. You should be able to validate by merging that branch into here.

TODO

1. Flesh out example in www/ to actually pull images from a directory in the resolver (based on a variable)
   • multiple galleries (query should take a variable) sourced from frontmatter
   • demonstrate a gallery somewhere
2. Allow configuration for data/schema locations - captured in Shared Workspaces and Contexts (Theme Packs) #570
3. How can plugins define or provide this to plugin-graphql (similar naming convention as default?) - Shared Workspaces and Contexts (Theme Packs) #570
4. Maybe for [RFC] External Data (Graph) Sources #21 , it could be more about how to get things into the graph specifically? - updated
5. support an assets graph - create an assets schema (assets.json) with queries and resolvers for assets as data #571
6. Test cases
7. Documentation
8. Revert example code

[thescientist13]

Naming / organization could maybe some have thought here, just so it's clearer what everything is and where it is coming from. (from greenwood, from user, from user content, etc)

[hutchgrant]

So this is great for unique queries for each individual user. If you want to extend it to have plugins include schema, we would need to do an additional directory walk of any plugins containing a graphql flag of somekind.

[hutchgrant]

This is good for individual users wanting to BYOQ(bring your own query) because now they can write custom resolvers and utilize the graph in many different ways. The gallery, as an example, is fine. But would like to confine the gallery typedefs + resolver + query + wrapper component to its own plugin package eventually.