[BUG] entrypoint issue for dispatcher

[goodwanghan]

This problem happens only when python>=3.10 and importlib-metadata is installed, plus some additional unknown conditions.

I am still unable to reproduce, but the error will look like:

.venv/lib/python3.10/site-packages/fugue/extensions/transformer/convert.py:177: in deco
    return _FuncAsTransformer.from_func(
.venv/lib/python3.10/site-packages/fugue/extensions/transformer/convert.py:296: in from_func
    tr._wrapper = FunctionWrapper(  # type: ignore
.venv/lib/python3.10/site-packages/fugue/_utils/interfaceless.py:163: in __init__
    self._class_method, self._params, self._rt = self._parse_function(
.venv/lib/python3.10/site-packages/fugue/_utils/interfaceless.py:246: in _parse_function
    res[k] = self._parse_param(anno, w)
.venv/lib/python3.10/site-packages/fugue/_utils/interfaceless.py:266: in _parse_param
    import fugue._utils.register  # pylint: disable=W0611 # noqa: F401
.venv/lib/python3.10/site-packages/fugue/_utils/register.py:17: in <module>
    register_plugins()
.venv/lib/python3.10/site-packages/fugue/_utils/register.py:8: in register_plugins
    for plugin in entry_points().get("fugue.plugins", []):
/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/importlib/metadata/__init__.py:1009: in entry_points
    return SelectableGroups.load(eps).select(**params)
/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/importlib/metadata/__init__.py:459: in load
    ordered = sorted(eps, key=by_group)
/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/importlib/metadata/__init__.py:1006: in <genexpr>
    eps = itertools.chain.from_iterable(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

iterable = <itertools.chain object at 0x7f2b102c1ff0>
key = operator.attrgetter('_normalized_name')

    def unique_everseen(iterable, key=None):
        "List unique elements, preserving order. Remember all elements ever seen."
        # unique_everseen('AAAABBBCCDAABBB') --> A B C D
        # unique_everseen('ABBCcAD', str.lower) --> A B C D
        seen = set()
        seen_add = seen.add
        if key is None:
            for element in filterfalse(seen.__contains__, iterable):
                seen_add(element)
                yield element
        else:
            for element in iterable:
>               k = key(element)
E               AttributeError: 'PathDistribution' object has no attribute '_normalized_name'

/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/importlib/metadata/_itertools.py:16: AttributeError

This is a bug related to pypa/setuptools#3452
But there is a solution that may also solve this triad problem: pypa/virtualenv@bb82a73