Flatten field adapter config

[timleslie]

We only support one adapter now, so this no longer needs to be a nested object.

[changeset-bot]

🦋 Changeset detected

Latest commit: 22361a0

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

This PR includes changesets to release 19 packages

Name	Type
@keystone-next/cloudinary	Major
@keystone-next/fields	Major
@keystone-next/fields-document	Major
@keystone-next/keystone-legacy	Major
@keystone-next/keystone	Major
@keystone-next/example-ecommerce	Patch
@keystone-next/benchmarks-legacy	Patch
@keystone-next/example-auth	Patch
@keystone-next/app-basic	Patch
keystone-next-app	Patch
@keystone-next/example-next-lite	Patch
@keystone-next/example-roles	Patch
@keystone-next/example-sandbox	Patch
@keystone-next/example-todo	Patch
@keystone-next/auth	Major
@keystone-next/website	Patch
@keystone-next/adapter-prisma-legacy	Patch
@keystone-next/test-utils-legacy	Patch
@keystone-next/admin-ui	Patch

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