extract PropsEditor outside from the example

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This PR includes changesets to release 8 packages

| Name | Type | | ------------------- | ----- | | @showroomjs/bundles | Patch | | @showroomjs/core | Minor | | react-showroom | Minor | | @showroomjs/ui | Minor | | client-only-example | Patch | | react-example | Patch | | subpath-example | Patch | | react-showroom-docs | Patch |

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