Add OpenXmlTableOptions to export sheets as Excel tables

[virzak]

Part of #975

Adds OpenXmlConfiguration.Table, which writes each exported sheet's data as an Excel table in a built-in style:

var configuration = new OpenXmlConfiguration
{
    TableStyles = TableStyles.None, // let the table style format the cells
    Table = new OpenXmlTableOptions { Name = "Welds", Style = "TableStyleMedium15", ShowFilterButton = false },
};
await exporter.ExportAsync(stream, rows, configuration: configuration);

• The table covers the header row and the data, and the sheet-level AutoFilter is left out because a sheet can't have both. Without a header row the table gets headerRowCount="0" and generated column names.

• Following the concerns in [Feature] - Support Tables and Table Styles during Export #975, it is opt-in and only for new sheets: InsertSheet with a table throws NotSupportedException, and so do columns placed with MiniExcelColumnIndex that leave gaps.

• Table names default to Table1, Table2 and so on per sheet. A custom Name is used for the first sheet and gets the sheet number appended on later ones.

• The written tables round-trip through QueryTable.

• To format a table's header without cell styles covering the table style, TableStyles.None now applies StyleOptions.HeaderStyle alignment and wrapping (not its fill), and OpenXmlHeaderStyle.RowHeight sets the header row height.

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