wireprototypes: convert `baseprotocolhandler.name` to an abstract property PyCharm was flagging the subclasses where this was declared as a `@property` with Type of 'name' is incompatible with 'baseprotocolhandler' But pytype didn't complain. This seems more correct, however. Since `Protocol` is already an `abc.ABCMeta` class, we don't need to mess with the class hierarchy.