Kwargs: startProfileAt (#6424)

Previous:

```
startProfileAt([x, y], %)
startProfileAt([x, y], sketch001)
```

New:
```
startProfile(%, at = [x, y])
startProfile(sketch001, at = [x, y])
```

rust/kcl-lib/tests/function_sketch_with_position/unparsed.snap

@@ -4,7 +4,7 @@ description: Result of unparsing function_sketch_with_position.kcl
 ---
 fn box(p, h, l, w) {
   myBox = startSketchOn(XY)
-    |> startProfileAt(p, %)
+    |> startProfile(at = p)
     |> line(end = [0, l])
     |> line(end = [w, 0])
     |> line(end = [0, -l])