Changes to Create cell specifications and instances from Uncountable recipes

removed the optional property specs/items/drift from the response with the 200 status

added the new optional request property accept

added the optional property changes_failed to the response with the 200 status

added the optional property changes_stale to the response with the 200 status

added the optional property instances_changed to the response with the 200 status

added the optional property instances_updated to the response with the 200 status

added the optional property specs/items/changes to the response with the 200 status

added the optional property specs/items/failures to the response with the 200 status

added the optional property specs/items/instances/items/changes to the response with the 200 status

added the optional property specs/items/instances_changed to the response with the 200 status

added the optional property specs/items/instances_stale to the response with the 200 status

added the optional property specs/items/instances_updated to the response with the 200 status

added the optional property specs/items/stale to the response with the 200 status

added the optional property specs/items/updated to the response with the 200 status

added the optional property specs_changed to the response with the 200 status

added the optional property specs_updated to the response with the 200 status

added the required property specs/items/fingerprint to the response with the 200 status

added the required property specs/items/instances/items/fingerprint to the response with the 200 status

endpoint added