vulkan/wsi: Add support for image -> image blits

vulkan/wsi: Add support for image -> image blits

The win32 swapchain can be backed by a DXGI swapchain, but such swapchains
are incompatible with STORAGE images (AKA UNORDERED_ACCESS usage in
DXGI). So, we need to allocate an intermediate image that will serve as
a render-target, and copy this image to the WSI image when QueuePresent()
is called. That's pretty similar to what we do for the buffer blit case,
except the image -> buffer copy is replaced by an image -> image copy.

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16200>