Request: Add Stepped Line Support for BarChart Component

[annimarip]

Currently, the BarChart component supports line overlays but only with smooth or straight line interpolation. There's no built-in support for stepped lines, which are essential for displaying data where values should remain constant between data points

Describe the solution you'd like:
Add a stepChart or stepped property to the lineConfig object in the BarChart component that creates a stepped line visualization. The stepped line should:

• Maintain the current value horizontally until the next data point
• Create vertical transitions at data points
• Work seamlessly with existing line configuration options

Proposed API:

lineConfig={{
  color: '#FF0000',
  thickness: 2,
  stepped: true, // New property
  hideDataPoints: true,
  curved: false,
  isAnimated: false,
}}

[Abhinandan-Kushwaha]

Thanks @annimarip for requesting this feature, will add it in the next release.