fun sizeProvider(provider: SizeProvider): DividerBuilder
Customizes the size of each divider in the grid. IMPORTANT: The default DividerOffsetProvider can't ensure the same size of the items in a grid when this method is called. If you want a different behavior, you can specify a custom DividerOffsetProvider with offsetProvider.
provider - the SizeProvider which will be invoked for each divider in the grid.
Return
this DividerBuilder instance.