Loading Indicator Style
data class LoadingIndicatorStyle(val enabled: Boolean = true, @ColorInt val color: Int = Color.LTGRAY, @ColorInt val trackColor: Int = Color.TRANSPARENT, val heightDp: Float = 1.0f) : Parcelable
Appearance of the loading indicator shown at the bottom of each page while the page is loading or progressively rendering, and at the bottom of the fragment while the document itself is loading.