NCHAR Test Fix

[Michael-A-McMahon]

This branch updates the bind type mapping tests to make use of R2dbcTypes NCHAR and NVARCHAR. These N types need to be configured if a String bind contains non-ascii characters. Otherwise, the driver binds the String as CHAR/VARCHAR, which use the database character. If the database character set is not one that supports non-ascii characters, then these tests would fail.

I also removed an .iml file from IntelliJ which should not have been included in our repo.