[charts] Support themeAugmentation

[alexfauquette]

The themeAugmentation works but in a bad way. Some typed properties does not work because of missing useThemeProps and lots of components added after the v6.alpha did not get added to the TS extends

I'm not entirely convinced. Plus the current strategy seems a bit chaotic.

Maybe it would be better to only target root components such as LineChart, BarChart, PieChart which have interesting props, and can customize nearly every thing with CSS selectors.

With this solution it is not possible to customize charts that mix lines and bars, or any other composition. But I expect people going that deep in customization to don't use themeing for charts styling.

I propose to wait for feedback about specific usecases in favor (or against) the support of themeAugmentation in charts before resuming the effort

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