Vulkan: Add command stream diagnostics when graph is disabled. Very simple diagnostics that prints out the command stream. Since there is very little deferral right now the graph itself became quite a bit simpler. Also fills in some missing values in the switch that prints the command name string. Bug: angleproject:4029 Change-Id: Ib64a7fed6f9f56ce406cc7dbc6cc993ed510e2cb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2065530 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>