Add support for ODBC 3.0 functions

Looking to add support for ODBC 3 functions like "CURRENT_TIMESTAMP" and "CURRENT_DATE()" as indicated in linke [1]. This would be in support of applications that auto-generate backend SQL such as Tableau or Spotfire.

[1] https://docs.microsoft.com/en-us/sql/odbc/reference/appendixes/time-date-and-interval-functions?view=ssdt-18vs2017