Kwargs: startProfileAt (#6424)

Previous:

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

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

public/kcl-samples/gridfinity-baseplate/main.kcl

@@ -21,7 +21,7 @@ height = firstStep + secondStep + thirdStep
 // Define a function which builds the profile of the baseplate bin
 fn face(plane) {
   faceSketch = startSketchOn(plane)
-    |> startProfileAt([0, 0], %)
+    |> startProfile(at = [0, 0])
     |> yLine(length = height)
     |> angledLine(angle = -45, lengthY = thirdStep)
     |> yLine(length = -secondStep)