Function render_to_svg 

pub fn render_to_svg(
    ws: &WorksheetXml,
    sst: &SharedStringTable,
    stylesheet: &StyleSheet,
    options: &RenderOptions,
) -> Result<String>

Render a worksheet to an SVG string.

Uses the worksheet XML, shared string table, and stylesheet to produce a visual representation of the sheet as SVG. The options parameter controls which sheet, range, and visual features to include.