vk/meta: Partially implement vkCmdCopy*, vkCmdBlit* for 3D images

vk/meta: Partially implement vkCmdCopy*, vkCmdBlit* for 3D images

Partially implement the below functions for 3D images:
    vkCmdCopyBufferToImage
    vkCmdCopyImageToBuffer
    vkCmdCopyImage
    vkCmdBlitImage

Not all features work, and there is much for performance improvement.
Beware that vkCmdCopyImage and vkCmdBlitImage are untested.  Crucible
proves that vkCmdCopyBufferToImage and vkCmdCopyImageToBuffer works,
though.

Supported:
    - copy regions with z offset

Unsupported:
    - copy regions with extent.depth > 1

Crucible test results on master@d452d2b are:
    pass: func.miptree.r8g8b8a8-unorm.*.view-3d.*
    pass: func.miptree.d32-sfloat.*.view-3d.*
    fail: func.miptree.s8-uint.*.view-3d.*