Configures the loading indicator for the Tree Grid, allowing you to display a visual indicator during data loading operations to enhance user experience.
IndicatorType
Specifies the type of loading indicator to be displayed. You can choose between:
* `Spinner`: Displays a spinning loader to indicate ongoing loading.
* `Shimmer`: Displays a shimmer effect that suggests content is loading.
Defaults to Syncfusion.EJ2.Grids.IndicatorType.Spinner