layers: Fix draw_state validation of descriptor updates with images

layers: Fix draw_state validation of descriptor updates with images

Earlier fix was broken b/c we didn't have format of swapchain images.

This fix adds the format to imageLayoutMap IMAGE_NODE struct, which contains all images created via vkCreateImage() as well as all swapchain images fetched via vkGetSwapchainImagesKHR().

This required enhancing the SWAPCHAIN_NODE to include the createInfo. Since this has a dangling ptr for queueIndices, added a constructor and destructor to that struct to handle allocation and clean-up of that ptr.