Add constraints to lock the vertical and horizontal dimensions

Property definitions

ios :: ui $ ListLayout :: native_add_constraints
	# Add constraints to lock the vertical and horizontal dimensions
	private fun native_add_constraints(root_view: UIView, nested_view: UIView)
	in "ObjC" `{
		[root_view addConstraints:[NSLayoutConstraint
			constraintsWithVisualFormat: @"V:|-0-[nested_view]-0-|"
			options: NSLayoutFormatAlignAllCenterX metrics: nil views: @{@"nested_view": nested_view}]];
		[root_view addConstraints:[NSLayoutConstraint
			constraintsWithVisualFormat: @"H:|-0-[nested_view]-0-|"
			options: NSLayoutFormatAlignAllCenterX metrics: nil views: @{@"nested_view": nested_view}]];
	`}
lib/ios/ui/ui.nit:471,2--480,3