[Improvement] Remove the need for TapGestureRecognizer on the SwitchView

Currently any control built from the `SwitchView` needs to add a TapGestureRecognizer to toggle the `IsToggled` property.
```csharp
void TapGestureRecognizer_Tapped(object sender, EventArgs e)
{
	IsToggled = !IsToggled;
}
```

If we can move this logic to the control it self, its just one less thing for people to do
