Wraps the functionality of managing monitoring workloads of commands
being sent to the VkQueue. In the future this will likely move to the
RendererVk class. This refactor allows the move to be easier to manage
and will let us more easily change ownership in the future if we have
to again.

Bug: angleproject:2464
Change-Id: I061bc2ba939d7004d74d00b976a753a53c96445c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1804884Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>