Add Segment Selection to LineChart

[normidar]

It would be great to have a segment selection feature in the LineChart of the fl_chart library. This feature would allow users to click or drag over a specific part of the chart to highlight or interact with selected data ranges.

Use Case:
This functionality would be useful for analyzing specific data ranges, such as focusing on particular time periods or value ranges. It would enhance the interactivity and usability of the charts, especially for data analysis, financial reports, and interactive dashboards.

Suggested Implementation:

• Detect touch or click events to identify the selected range.
• Visually highlight the selected segment.
• Provide callback functions to access the data of the selected range.

Thank you for considering this feature request.