K8s/Folders: Add folders api service (with legacy storage) (#79413)

kinds/folder/folder_kind.cue

@@ -1,25 +0,0 @@
-package kind
-
-name:        "Folder"
-maturity:    "merged"
-description: "A folder is a collection of resources that are grouped together and can share permissions."
-
-lineage: schemas: [{
-	version: [0, 0]
-	schema: {
-		spec: {
-			// Unique folder id. (will be k8s name)
-			uid: string
-
-			// Folder title
-			title: string
-
-			// Description of the folder.
-			description?: string
-		} @cuetsy(kind="interface")
-		//
-		// TODO:
-		// common metadata will soon support setting the parent folder in the metadata
-		//
-	}
-}]