Function render_table_with_columns 

pub fn render_table_with_columns(
    headers: &[&str],
    rows: &[Vec<&str>],
    style: TableStyle,
    columns: &[ColWidth],
    alignments: Option<&[Align]>,
    trunc_modes: Option<&[TruncateMode]>,
    zebra: bool,
    row_separators: bool,
) -> String

Render with explicit per-column widths.