Syntax changes for CREATE STATEMENT GA

CREATE FUNCTION statement syntax has been changed slightly to match analytics.
1- we now support CREATE OR REPLACE FUNCTION, where a function is dropped and recreated in one step

2- an empty parameter list now means the function takes no arguments
this will be enforced at execution
variadic functions are signalled by 3 dots inside the parenthesis:

CREATE FUNCTION func1(...)

3- the javascript object syntax has changed from

AS

to

AS "object" AT "library"