webnn: implement reverse operator
This CL adds IDL and mojo definition of reverse operator according to
the spec issue [1] and implements it on DirectML backend.
[1] webmachinelearning/webnn#773
Bug: 376707210
Change-Id: I0d42b49b87ce243db9d44512e6000c7ee901077b
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel, mac14.arm64-blink-rel, mac15.arm64-blink-rel, linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5979825
Commit-Queue: ningxin hu ningxin.hu@intel.com
Auto-Submit: Shiyi Zou shiyi.zou@intel.com
Reviewed-by: Austin Sullivan asully@chromium.org
Reviewed-by: ningxin hu ningxin.hu@intel.com
Cr-Commit-Position: refs/heads/main@{#1382078}