chore(): labelContext should be optional

Author: Licen-it

src/treeview/tree-node.types.ts

@@ -2,7 +2,7 @@ import { TemplateRef } from "@angular/core";
 
 export interface Node {
 	label: string | TemplateRef<any>;
-	labelContext: any;
+	labelContext?: any;
 	value?: any;
 	id?: string;
 	active?: boolean;