[tools] Improve callstats.html

CSV Support:
- Add import merged CSV from results.html
- Aggregate multiple runs and calculate stddev on them

Charts:
- Defer rendering charts for responsive UI
- Clean up chart rendering in general
- Sort charts based on raw chart data for speedups
- Show chart annotations
- Add chart total, displaying the total value for the currently
  selected categories
- Fix sorting by chart total
- Add average row for all charts

Change-Id: I1e542f319172ecf158dcb44f8da7ad6e81aafe41
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2675934Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72562}