Added basic support for array layers in Image objects.
This allows allocating the memory for multiple layers,
copying between a 2D image with multiple layers to and
from a 3D image.

Passes all tests in:
dEQP-VK.api.copy_and_blit.core.image_to_image.3d_images.*

Bug b/119620767

Change-Id: I305650ba89f90dcd527b484fc3ed095a309506d1
Reviewed-on: https://swiftshader-review.googlesource.com/c/23208Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>