Improve error when raw-to-derived argument is declared without explicit type in derived_signal_rw

[Villtord]

If I make a derived signal like this

self._internal_order = soft_signal_rw(int, initial_value=3)
self.order = derived_signal_rw(
                self._get_order,
                self._set_order,
                current_order = self._internal_order
                ) 

def _get_order(self, current_order) -> int:
        return current_order

async def _set_order(self, new_order: int) -> None:
    self._internal_order.set(new_order)

That is without specifying return Type of parameter in _get_order() function, then
I will get an error trying to read from this signal which is not really very clear
ERROR tests/devices/test_undulator.py::test_order_read - TypeError: Expected the following to be passed as keyword arguments {}, got {'current_order': <class 'int'>}
So looks like current_order argument has been excluded from _get_order function arguments.

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