Support full Recharts LabelProps for reference line labels

[JonathanG-DC]

Mantine Chart reference line labels currently expose only a limited subset of Recharts LabelProps. This prevents the use of already supported Recharts options such as angle, which is particularly useful for busy charts.

Proposed change:
Allow forwarding the full Recharts LabelProps to reference line labels either directly or via a dedicated labelProps field.

Example:

referenceLines={[
  // Existing regular reference line
  {
    x: 50,
    label: 'Test1',
  },
  // String or PropObject
  {
    x: 60,
    label: { 
        value: 'Test2', 
        angle: -30 
    },
  },
  // Dedicated labelProps
  {
    x: 70,
    label: 'Test3',
    labelProps: { 
        angle: -30 
    },
  },
]}

Mantine implementation:

mantine/packages/@mantine/charts/src/CompositeChart/CompositeChart.tsx

Lines 378 to 383 in b90d9b8

	label={{
	value: line.label,
	fill: line.color ? color : 'currentColor',
	fontSize: 12,
	position: line.labelPosition ?? 'insideBottomLeft',
	}}

Recharts interface:
https://github.com/recharts/recharts/blob/3dd3254165cada722e8fb053d322814443e9115d/src/component/Label.tsx#L45-L124

Angle value demo using base Recharts: