ShimmerPlugin implementation

ShimmerPlugin.kt

@Immutable
public data class ShimmerPlugin(
  val shimmer: Shimmer = Shimmer.Flash(
    baseColor = Color.DarkGray,
    highlightColor = Color.LightGray,
  ),
) : ImagePlugin.LoadingStatePlugin {

  @Composable
  override fun compose(
    modifier: Modifier,
    imageOptions: ImageOptions,
    executor: @Composable (IntSize) -> Unit,
  ): ImagePlugin = apply {
    ShimmerContainer(
      modifier = modifier,
      shimmer = shimmer,
    )
  }
}