KCL: Add planeOf function to stdlib (#7643)

Gets the plane a face lies on, if any.

Closes #7642

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

@@ -226,10 +226,7 @@ impl From<&KclValue> for OpKclValue {
         match value {
             KclValue::Uuid { value, .. } => Self::Uuid { value: *value },
             KclValue::Bool { value, .. } => Self::Bool { value: *value },
-            KclValue::Number { value, ty, .. } => Self::Number {
-                value: *value,
-                ty: ty.clone(),
-            },
+            KclValue::Number { value, ty, .. } => Self::Number { value: *value, ty: *ty },
             KclValue::String { value, .. } => Self::String { value: value.clone() },
             KclValue::Tuple { value, .. } | KclValue::HomArray { value, .. } => {
                 let value = value.iter().map(Self::from).collect();