demos: Implement JSON coverage for more Vk objs
demos: Implement JSON coverage for more Vk objs

Change-Id: I6584027b83e4d55e2ad99680f7f3645a45285917

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools