Add field groups

[emmatown]

This adds the ability to group fields together in the Admin UI with a label and description

list({
  ...etc,
  fields: {
    ...group({
      label: "Some group",
      description: "Some group description"
      fields: {
        something: text(),
        ...etc,
      }
    }),
    ...etc,
  }
})

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Name	Status	Preview	Updated
keystone-next-docs	✅ Ready (Inspect)	Visit Preview	Nov 16, 2022 at 3:35AM (UTC)

[changeset-bot]

🦋 Changeset detected

Latest commit: 1157235

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

This PR includes changesets to release 1 package

Name	Type
@keystone-6/core	Minor

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[emmatown]

This is an unrelated thing I noticed when re-generating the types for the admin meta query, I don't think it was intentionally nullable. Types elsewhere assumed it was non-nullable so I've made it non-nullable.