Test copying data between compressed and uncompressed images

Test copying data between compressed and uncompressed images

New tests were added to verify that when copying data between
compressed and uncompressed formats the extent members represent the
texel dimensions of the source image and not the destination.

Helper functions for querying information about compressed formats were
moved from vktImageTestUtil to vkImageUtil.

New tests:

dEQP-VK.api.copy_and_blit.core.image_to_image.all_formats.color.*

Components: Vulkan, Framework

VK-GL-CTS issue: 1081
VK-GL-CTS public issue: 90

Change-Id: Ie639e5d96a478ec1d8ef5c4abc73aa80a8005219