[IMP] types: correctly support Set type for props-validation

Previously, having a Set as a type in the static props description
of a component would would lead to a type error.

This commit adds Set to the list of supported types in the Schema

src/runtime/validation.ts

@@ -9,6 +9,7 @@ type BaseType =
   | typeof Object
   | typeof Array
   | typeof Function
+  | typeof Set
   | true
   | "*";