Operator Name change

Except_All is now ExceptOperator since it does all and distinct
operations
The same has been done with Intersect_All
Changes made in AISBinder and API to reflect this
Union, Except, and Intersect now SetPlanNode

Changed these set plan class to work for all set operators
Consolidated similar set methods

consolidated functions in ASTStatementLoader that were similar with all
set operators
Tests added

test-except.yaml
test-intersect.yaml
ExceptOperatorIT
tests added

All these tests have been passed