Auto-complete of plugin names in preset

[benjie]

Description

When you define a plugin, declare you've done so:

declare global {
  namespace GraphileConfig {
    interface Plugins {
      MyPlugin: true
    }
  }
}

const plugin: GraphileConfig.Plugin = {
  name: "MyPlugin",

Then the plugin will show up in the TypeScript auto-complete:

Fixes graphile/crystal-pre-merge#174

Performance impact

None.

Security impact

None.

Checklist

• My code matches the project's code style and yarn lint:fix passes.
• I've added tests for the new feature, and yarn test passes.
• I have detailed the new feature in the relevant documentation.
• I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• If this is a breaking change I've explained why.

[changeset-bot]

🦋 Changeset detected

Latest commit: 792988e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
graphile-build-pg	Patch
graphile-build	Patch
postgraphile	Patch
graphile-config	Patch
graphile-utils	Patch
pgl	Patch
graphile	Patch
@localrepo/grafast-bench	Patch
@dataplan/pg	Patch
grafast	Patch
@grafserv/persisted	Patch
grafserv	Patch
ruru	Patch
@dataplan/json	Patch
ruru-components	Patch
@localrepo/grafast-website	Patch
graphile-export	Patch

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