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/linear_pattern3d_a_pattern/input.kcl

@@ -1,5 +1,5 @@
 exampleSketch = startSketchOn('XZ')
-  |> startProfileAt([0, 0], %)
+  |> startProfile(at = [0, 0])
   |> line(end = [0, 2])
   |> line(end = [3, 1])
   |> line(end = [0, -4])