Add support for ORDER hint

[yorek]

BULK INSERT allow to specify if data already has a specific order so that Azure SQL / SQL Server can avoid sorting it again if inserting data into a clustered index.

https://docs.microsoft.com/en-us/sql/t-sql/statements/bulk-insert-transact-sql?view=sql-server-ver15

[luxu1-ms]

There is no implementation of order hints for SQLServerBulkCopy.class, SQLServerBulkCopyOptions.class. Thus it is not able to add hint support in spark mssql connector. I opened the issue below in MSSQL JDBC repo to ask the mssql jdbc team to support the order hints.
microsoft/mssql-jdbc#1481