Function addColumn

addColumn(worksheet: Worksheet, name: string, index: number): void
Adds a new column to the worksheet at the specified index.
Parameters
- worksheet: Worksheet
  The ExcelJS worksheet.
- name: string
  The header name for the new column.
- index: number
  The 1-based column index where the new column should be inserted.
Returns void
Example
```
addColumn(worksheet, 'Name', 3);
```
- Defined in src/excel/excel.tsx:737