Add vulkan renderer

[WillPower3309]

Just like wlr_renderer, we should have a vulkan implementation of our fx renderer.

This will be more important to implement once color management / HDR support is available in wlroots, as it looks like the GLES2 renderer there will be soft deprecated: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/3804