User plots and new metrics

[arl]

• New go1.20/go1.21 metrics
  • New plots showing new go1.20/1.21 runtime/metrics:
  • GC Cycles
  • GC Scan
  • Memory classes
  • CPU classes
  • Mutex wait
  • Users can now add their own plot. For now heatmaps are not supported, but scatter, bar and stacked plots have been added.

[codecov[bot]]

Codecov Report

Attention: 64 lines in your changes are missing coverage. Please review.

Comparison is base (cca6221) 90.00% compared to head (6fb7812) 61.58%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #111 +/- ## =========================================== - Coverage 90.00% 61.58% -28.42% =========================================== Files 3 2 -1 Lines 90 177 +87 =========================================== + Hits 81 109 +28 - Misses 6 64 +58 - Partials 3 4 +1 ``` | [Files](https://app.codecov.io/gh/arl/statsviz/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Aur%C3%A9lien+Rainone) | Coverage Δ | | |---|---|---| | [statsviz.go](https://app.codecov.io/gh/arl/statsviz/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Aur%C3%A9lien+Rainone#diff-c3RhdHN2aXouZ28=) | `77.16% <77.67%> (+8.98%)` | :arrow_up: | | [userplot.go](https://app.codecov.io/gh/arl/statsviz/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Aur%C3%A9lien+Rainone#diff-dXNlcnBsb3QuZ28=) | `22.00% <22.00%> (ø)` | |

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