[ExecuTorch][WebGPU] GPU timestamp query profiling (general implementation) (#20258)

This PR was created by the merge bot to help merge the original PR into
the main branch.
ghstack PR number: #20201 by
@JulianCloudNTH
^ Please use this as the source of truth for the PR details, comments,
and reviews
ghstack PR base:
https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/22/base
ghstack PR head:
https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/22/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head:
https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/22/orig

@diff-train-skip-merge

Co-authored-by: Julian Ng-Thow-Hing <juliannth@meta.com>

Author: pytorchbot