Refactoring: use typed versions of args getters (#7262)

* Replace uses of get_unlabeled_kw_arg with _typed version

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Remove more untyped arg getters

Signed-off-by: Nick Cameron <nrc@ncameron.org>

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>

rust/kcl-lib/src/execution/types.rs

@@ -44,6 +44,10 @@ impl RuntimeType {
         RuntimeType::Primitive(PrimitiveType::Sketch)
     }
 
+    pub fn sketch_or_surface() -> Self {
+        RuntimeType::Union(vec![Self::sketch(), Self::plane(), Self::face()])
+    }
+
     /// `[Sketch; 1+]`
     pub fn sketches() -> Self {
         RuntimeType::Array(