Graphql TS schema extensions

[emmatown]

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[changeset-bot]

🦋 Changeset detected

Latest commit: d947f89

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

This PR includes changesets to release 15 packages

Name	Type
@keystone-next/keystone	Minor
@keystone-next/auth	Major
@keystone-next/cloudinary	Major
@keystone-next/fields-document	Major
@keystone-next/session-store-redis	Major
@keystone-next/example-auth	Patch
@keystone-next/examples-app-basic	Patch
@keystone-next/example-ecommerce	Patch
keystone-next-app	Patch
@keystone-next/example-roles	Patch
@keystone-next/example-sandbox	Patch
@keystone-next/example-testing	Patch
@keystone-next/example-with-auth	Patch
@keystone-next/website	Patch
@keystone-next/example-document-field	Patch

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[dcousens]

From @mitchellhamilton in a call, this should never exist as a null, so this change should be OK (and is enforced by Typescript)