Metal: Support 2D array textures and base & max levels. Bug: angleproject:2634 Change-Id: If9e50cec46bdf5f472f1e58c6e82a67b524e2408 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2433327 Commit-Queue: Le Hoang Quyen <le.hoang.q@gmail.com> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>