kvstore: merge the metadata store into the datastore (#110334)

* migrate eventstore to datastore

* Add folder to event key

* lint

* lint

* lint

* lint

* remove foundkye

* refactor the Keys methods to move the Sort outside the ListKey method

* remove bad import

* fix missing params

* lint

* fix test

* perf improvement

pkg/storage/unified/resource/eventstore.go

@@ -28,10 +28,11 @@ type EventKey struct {
 	Name            string
 	ResourceVersion int64
 	Action          DataAction
+	Folder          string
 }
 
 func (k EventKey) String() string {
-	return fmt.Sprintf("%d~%s~%s~%s~%s~%s", k.ResourceVersion, k.Namespace, k.Group, k.Resource, k.Name, k.Action)
+	return fmt.Sprintf("%d~%s~%s~%s~%s~%s~%s", k.ResourceVersion, k.Namespace, k.Group, k.Resource, k.Name, k.Action, k.Folder)
 }
 
 func (k EventKey) Validate() error {
@@ -53,7 +54,9 @@ func (k EventKey) Validate() error {
 	if k.Action == "" {
 		return fmt.Errorf("action cannot be empty")
 	}
-
+	if k.Folder != "" && !validNameRegex.MatchString(k.Folder) {
+		return fmt.Errorf("folder '%s' is invalid", k.Folder)
+	}
 	// Validate each field against the naming rules (reusing the regex from datastore.go)
 	if !validNameRegex.MatchString(k.Namespace) {
 		return fmt.Errorf("namespace '%s' is invalid", k.Namespace)
@@ -67,7 +70,9 @@ func (k EventKey) Validate() error {
 	if !validNameRegex.MatchString(k.Name) {
 		return fmt.Errorf("name '%s' is invalid", k.Name)
 	}
-
+	if k.Folder != "" && !validNameRegex.MatchString(k.Folder) {
+		return fmt.Errorf("folder '%s' is invalid", k.Folder)
+	}
 	switch k.Action {
 	case DataActionCreated, DataActionUpdated, DataActionDeleted:
 	default:
@@ -97,7 +102,7 @@ func newEventStore(kv KV) *eventStore {
 // ParseEventKey parses a key string back into an EventKey struct
 func ParseEventKey(key string) (EventKey, error) {
 	parts := strings.Split(key, "~")
-	if len(parts) != 6 {
+	if len(parts) != 7 {
 		return EventKey{}, fmt.Errorf("invalid key format: expected 6 parts, got %d", len(parts))
 	}
 
@@ -113,6 +118,7 @@ func ParseEventKey(key string) (EventKey, error) {
 		Resource:        parts[3],
 		Name:            parts[4],
 		Action:          DataAction(parts[5]),
+		Folder:          parts[6],
 	}, nil
 }