Kwargs: startProfileAt (#6424)

Previous:

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

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

rust/kcl-lib/src/lsp/copilot/mod.rs

@@ -264,7 +264,7 @@ impl Backend {
             completion_list.push(
                 r#"fn cube = (pos, scale) => {
   const sg = startSketchOn('XY')
-    |> startProfileAt(pos, %)
+    |> startProfile(at = pos)
     |> line([0, scale], %)
     |> line([scale, 0], %)
     |> line([0, -scale], %)