@Override
    public BigDecimal convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty,
                                        GlobalConfiguration globalConfiguration) throws ParseException {
        return NumberUtils.parseBigDecimal(cellData.getStringValue(), contentProperty);
    }
Converts Excel cell data to a BigDecimal object.
This method parses the string value from the cell data into a BigDecimal using utility methods.

@param cellData               The Excel cell data containing the string value.
@param contentProperty        The content property associated with the cell.
@param globalConfiguration    The global configuration for the conversion process.
@return                       The converted BigDecimal value from the string.
@throws ParseException        If there is an error parsing the string to a BigDecimal.
fastexcel-core/src/main/java/cn/idev/excel/converters/bigdecimal/BigDecimalStringConverter.java