Add radio button option to select

[Achisingh]

A radio button ui.displayMode option is provided to configure the display of select field in the Admin UI. The displayMode options available to users are ['select', 'segmented-control', 'radio'].

The radio displayMode is used for

single select fields.

[changeset-bot]

🦋 Changeset detected

Latest commit: e3b8d27

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

This PR includes changesets to release 16 packages

Name	Type
@keystone-6/core	Minor
@keystone-6/auth	Major
@keystone-6/cloudinary	Major
@keystone-6/fields-document	Major
@keystone-6/session-store-redis	Major
@keystone-6/example-auth	Patch
@keystone-6/examples-app-basic	Patch
@keystone-6/example-with-custom-session-validation	Patch
@keystone-6/example-ecommerce	Patch
@keystone-6/example-graphql-api-endpoint	Patch
@keystone-6/example-roles	Patch
@keystone-6/example-testing	Patch
@keystone-6/example-with-auth	Patch
@keystone-6/sandbox	Patch
@keystone-6/website	Patch
@keystone-6/example-document-field	Patch

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Name	Status	Preview	Updated
keystone-next-docs	✅ Ready (Inspect)	Visit Preview	Sep 2, 2022 at 1:11AM (UTC)

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Latest deployment of this branch, based on commit e3b8d27:

Sandbox	Source
@keystone-6/sandbox	Configuration

[dcousens]

LGTM