Add creation function for csv-row-record type

[fidothe]

The csv-row-record type used by the CSV XDM mapping provides its fields and an accessor function that can perform field lookup by index or column name. The column names are set when the CSV is parsed. For users who want to make use of csv-row-record (when needing to parse CSVs that fn:parse-csv itself cannot handle out-of-the-box, perhaps) we should provide a creation function that accepts the name: index map and the fields for the row and creates a csv-row-record with a correctly functioning field function entry.

[michaelhkay]

After the changes that have now been made to the CSV family of functions, I don't think this enhancement would add significant value, so I propose dropping it.

[michaelhkay]

The WG agreed to close this with no action on 2024-04-09.