Add systrace markers for various RendererVk::finish paths in order to
quickly identify cause of finishes. Also added marker to commandPool
destroy which is currently a known hotspot on some devices.

Bug: angleproject:2528
Change-Id: I5a2fc741679a58445d71a2edd6204cf9e869d236
Reviewed-on: https://chromium-review.googlesource.com/c/1454277
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>