pyright and extending workplane

You can use cq.Workplane.x = myfun or such.

https://github.com/CadQuery/cadquery/issues/1644

See this about a workaround which allows pyright to type the code.

Another way to get this all done would be to introduce this syntax in Python:
```
def ext(wp, params):
...
wp..ext(params) where .. means turn this into ext(wp, params)
```

No idea where to put this issue. Maybe somebody else finds it helpful.