Convert all lengths to mm for engine calls

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

rust/kcl-lib/tests/import_async/input.kcl

@@ -38,11 +38,11 @@ invas = map(angles, fn(a) {
 
 // Map the involute curve
 xs = map([0..cmo], fn(i) {
-  return rs[i] * cos(invas[i])
+  return rs[i] * cos(invas[i]: number(rad))
 })
 
 ys = map([0..cmo], fn(i) {
-  return rs[i] * sin(invas[i])
+  return rs[i] * sin(invas[i]: number(rad))
 })
 
 // Extrude the gear body