Jack Conradson cd3744c0b7 Add nodes to handle types (#49785)
This PR adds 3 nodes to handle types defined by a front-end creating a 
Painless AST. These types are decided with data immutability in mind - 
hence the reason for more than a single node.
2019-12-05 17:09:19 -08:00
..
2019-12-05 17:09:19 -08:00