Proposal to allow setting cursor options on Portals

Greetings,

My main driver here is to allow the creation of Holdable portals at the protocol level for drivers. Currently the only way to create a holdable cursor is at the SQL level. 

DECLARE liahona CURSOR WITH HOLD FOR SELECT * FROM films;

The JDBC driver has an option in the API to have result sets survive commits see https://docs.oracle.com/javase/8/docs/api/java/sql/Connection.html#createStatement-int-int-int-

Doing this at the protocol level is the correct way to do this as modifying the SQL to create a cursor is very cumbersome and we already have existing code to create a portal. Adding the ability to specify options 

Looking for feedback.