Function recurse

packages/table-core/src/features/ColumnSizing.ts:323–329

(header: Header<TData, TValue>)

      let sum = 0

      const recurse = (header: Header<TData, TValue>) => {
        if (header.subHeaders.length) {
          header.subHeaders.forEach(recurse)
        } else {
          sum += header.column.getSize() ?? 0
        }
      }

      recurse(header)