Experimental settings BETA tag (#509)

* Add BETA tag for experimental setting

* Mark node searchbox impl as experimental

* nit

src/types/settingTypes.ts

@@ -43,4 +43,5 @@ export interface SettingParams {
   // default category from id.
   // Note: Like id, category value need to be unique.
   category?: string[]
+  experimental?: boolean
 }