Vulkan: ANGLE_copy_texture_3d support Bug: angleproject:4748 Test: CopyTexImage*Vulkan:Texture3DCopy*Vulkan:Texture2DArrayCopy*Vulkan Test: dEQP.KHR_GLES3/copy_tex_image_conversions_required_cubemap*cubemap* Change-Id: Ifdc3d455ca8c9e732d0adf4afa9e2809d780ae18 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2246320 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>