Test that Vulkan backend works without dynamic rendering

[hazeycode]

The Vulkan backend that was kindly contributed has only been verified working with dynamic rendering so far.

[Name-hw]

https://github.com/Name-hw/JanRenderer/blob/main/src/JanRenderer/JrObjects/JrGui.zig
The above code is not a perfect test because it requires externally setting ImGui_ImplVulkan_InitInfo, device, queueFamilyIndex, queue, swapChainImageFormat, swapChainExtent, swapChainImageViews, msaaSamples, window, etc. and calling init(), newFrame(), render() functions. However, I share it because I think it will be helpful.