API Migrate code and docs from other modules

[emteknetnz]

Issue silverstripe/silverstripe-admin#1799

Have validated that the front end schema is still usable:

composer require silverstripe/graphql-devtools

app/_config/graphql.yml

---
name: app-graphql
after: "*"
---
SilverStripe\Control\Director:
  rules:
    'graphql': '%$SilverStripe\GraphQL\Controller.default'

SilverStripe\GraphQL\Schema\Schema:
  schemas:
    default:
      src:
       - "app/_graphql"

app/_graphql/models.yml

Page:
  fields: '*'
  operations: '*'

dev/build flush=1

Test using graphql devtool

https://mysite.test/dev/graphql/ide

Test a query

query {
  readPages {
    nodes {
      title
      content
    }
  }
}

Test migrated versioning plugin

(Make draft changes on page ID = 2 in the CMS)

mutation {
  publishPage(id: 2) {
    id
  }
}

Refersh the CMS - page has been published

[emteknetnz]

This is needed because after moving the location of this test in recipe-kitchen-sink, some other test was somehow interfering with this. This just sets up the Security token so that it's in the correct state for the test, and then resets it to however it was before

[GuySartorelli]

I assume those docs are all just directly copy/pasted, and haven't been altered at all?
They may need retouching when they get added back into the "other features" section but there's a separate card for that so that's okay.

[GuySartorelli]

LGTM will merge when other PRs are happy

[GuySartorelli]

re-approved most recent changes