webgpu: Add non-shared argminmax program (#6778)
webgpu: Add non-shared argminmax program (#6778)

* webgpu: Add non-shared argminmax program

The perf of ArgMax[1, 1025, 2049, 19] in cityscapes architecture in
DeepLabV3 is very poor. With this changes, this op becomes 6.3ms from
22.36ms.

* Add annotation

Co-authored-by: Linchenn <0ed8664fc7ecbbe813d402c21a5307ffd7acaed7@users.noreply.github.com>
tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs