[charts] Allow to partially provide bar/line charts x-axis

[alexfauquette]

The bar chart has a good default x-axis that automatically set the scale type to band, and populate data with needed array to display the y-values.

But those default are only applied if there is no axis provided:

mui-x/packages/x-charts/src/BarChart/useBarChartProps.ts

Lines 81 to 86 in 0c98c78

	xAxis:
	xAxis ??
	(hasHorizontalSeries ? undefined : [{ id: DEFAULT_X_AXIS_KEY, ...defaultAxisConfig }]),
	yAxis:
	yAxis ??
	(hasHorizontalSeries ? [{ id: DEFAULT_Y_AXIS_KEY, ...defaultAxisConfig }] : undefined),

It should:

1. Always defaultised the scale type to band
2. defaultized the data if neither data nor dataKey are provided

The idea is to allow xAxis={[{ zomm: true }]} to work with bar chart

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