Create standard ABC for wrapped Java objects

[devinrsmith]

We need a standard interface that all python wrapped Java objects can implement to make it easier for downstream code to unwrap.

Currently, pyintegration/deephaven2/server/script_session/__init__.py / unwrap_to_java_type code looks like:

    if isinstance(object, deephaven2.table.Table):
        return object.j_table
    if isinstance(object, deephaven.Plot.figure_wrapper.FigureWrapper):
        return object.figure

As we wrap more types, a generic ABC for wrapped Java types would make this sort of logic much easier. For example:

    if isinstance(object, JavaWrappedABC):
        return object.j_object

[devinrsmith]

Chatting w/ Jianfeng, maybe something like:

class DHWrappedABC(ABC):
    @property
    @abc.abstractmethod
    def j_object(self) -> JType:
        pass

[jmao-denver]

closed by #1825