Add RangeBarSeries demo to InventoryManagement reports chart

[Copilot]

This update adds a WinForms sample demonstrating the new RangeBarSeries by adapting an existing chart in InventoryManagement. The sample now shows per-month value ranges (low/high) instead of separate weekly columns, aligned with the new series’ expected axis orientation and data shape.

• Scope: extend existing demo path

  • Updated the third chart setup in InventoryManagementForm.OnLoad (datachartReportsSales) rather than introducing a new form/sample surface.

• Range Bar data shaping

  • Added a local rangeBarData table with Month, Low, and High.
  • Derived Low/High from the existing monthly week values (Week 1..Week 4) so the demo reuses current sample data.

• Series + axis migration

  • Replaced ColumnSeries configuration with RangeBarSeries.
  • Switched axes to NumericXAxis + CategoryYAxis and bound:
    • HighMemberPath = "High"
    • LowMemberPath = "Low"

var xAxis3 = new NumericXAxis();
var yAxis3 = new CategoryYAxis()
{
    DataSource = rangeBarData,
    Label = "Month"
};

var series3 = new RangeBarSeries()
{
    DataSource = rangeBarData,
    HighMemberPath = "High",
    LowMemberPath = "Low",
    XAxis = xAxis3,
    YAxis = yAxis3
};