Support the SQL Server hierarchyid field type

Many data platforms require hierarchical data. There are quite complex ways of dealing with this kind of data that often require recursive CTEs with usually bad performance..But SQL Server has had a specific data type for this since SQL 2008. It would be good if TimeXtender supported the hierarchyid field so we could use this.

See: https://learn.microsoft.com/en-us/sql/relational-databases/hierarchical-data-sql-server?view=sql-server-ver16