create_renderpass does not natively support subpass self-dependencies

[JakobPer]

If you want to use pipeline barriers withing a renderpass or subpass, a self-dependency to the subpass the barrier is used in needs to be specified during renderpass creation. Details here.

This can currently be circumvented by using the alterConfigBeforeCreation feedback, but needs to be done with native Vulkan configs. A suitable abstraction (maybe in the renderpass_sync?) would be great for that.