Add support for GL_OES_texture_cube_map_array to the Vulkan backend
if the underlying ICD supports creation of of cube array ImageViews

Bug: angleproject:3584
Test: dEQP-GLES31.functional.fbo.color.texcubearray.*
Change-Id: I636cbf347d718abfc1600119b312578370b8e02e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2437989
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>