Unified Storage /Folders: Allow Unified Storage subfolders creation (#94327)

* Add parents field to folder DTO
* Allow subfolder creation when folder flag is enabled
* Update UnstructuredToLegacyFolder
* Include parents field when creating folder

pkg/storage/unified/sql/server.go

@@ -1,6 +1,9 @@
 package sql
 
 import (
+	"context"
+
+	"github.com/grafana/authlib/claims"
 	infraDB "github.com/grafana/grafana/pkg/infra/db"
 	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
@@ -31,5 +34,16 @@ func NewResourceServer(db infraDB.DB, cfg *setting.Cfg, features featuremgmt.Fea
 		opts.Index = resource.NewResourceIndexServer()
 	}
 
+	if features.IsEnabledGlobally(featuremgmt.FlagKubernetesFolders) {
+		opts.WriteAccess = resource.WriteAccessHooks{
+			Folder: func(ctx context.Context, user claims.AuthInfo, uid string) bool {
+				// #TODO build on the logic here
+				// #TODO only enable write access when the resource being written in the folder
+				// is another folder
+				return true
+			},
+		}
+	}
+
 	return resource.NewResourceServer(opts)
 }