Add SwigPtrView 's fields as properties

This way, `dir(SwigPtrView(...))` will show the available fields
and sufficiently smart IDEs will show them for code completion.

python/sdist/amici/numpy.py

@@ -91,6 +91,13 @@ def __init__(self, swigptr):
         self._cache = {}
         super(SwigPtrView, self).__init__()
 
+        # create properties for all fields
+        for field in self._field_names:
+            if not hasattr(self.__class__, field):
+                setattr(
+                    self.__class__, field, property(lambda self: self[field])
+                )
+
     def __len__(self) -> int:
         """
         Returns the number of available keys/fields