[charts] Add axis highlight to the radar

[alexfauquette]

Follow up on #16406

Main topics:

• I did not introduce a rotation-axis entry in the interact. Instead, I reused the x-axis under the assumption that x/y is similar to rotation/radius in practice.
• I copied the getAxisValue function even though most of the code is similar. Manipulating angles and the fact that 0° and 360° are the same will pollute the main one.

TODO before merging

• Refine the highlight design
• Add propose to manage highlight behavior and document it

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[mui-bot]

Deploy preview: https://deploy-preview-16868--material-ui-x.netlify.app/

Updated pages:

• docs/data/charts/radar/radar.md

Generated by 🚫 dangerJS against c50670d

[codspeed-hq]

CodSpeed Performance Report

Merging #16868 will not alter performance

_{Comparing alexfauquette:radar-highlight (c50670d) with master (94ef0a4)}

Summary

✅ 7 untouched benchmarks

[JCQuintas]

Does it make sense to highlight slices? 🤔
If yes, should they be less opaque (0.9 maybe)? 😆

[alexfauquette]

I don't think it make sense. The different configuration make it look weird. But the point look also weird for single series. That's why I ended up with the current default

[JCQuintas]

• I did not introduce a rotation-axis entry in the interact. Instead, I reused the x-axis under the assumption that x/y is similar to rotation/radius in practice.

Though it works.

In the future, we should start thinking of another name for axes in these global utilities. Main/Other or Main/Cross like css? 🤔