Make numpydoc respect `autodoc_member_order`

autodoc comes with the parameter autodoc_member_order, which can be set to one of {'alphabetical', 'groubwise', 'bysource'}: http://www.sphinx-doc.org/en/stable/ext/autodoc.html#confval-autodoc_member_order

numpydoc doesn't respect that parameter, but always orders class attributes and methods alphabetically, first here, through inspect
https://github.com/numpy/numpydoc/blob/8c1e85c746d1c95b9433b2ae97057b7f447c83d1/numpydoc/docscrape.py#L613
and then again here
https://github.com/numpy/numpydoc/blob/8c1e85c746d1c95b9433b2ae97057b7f447c83d1/numpydoc/docscrape.py#L591

wouldn't it be relatively simple to make numpydoc respect the parameter by following what autodoc does?

it retrieves the order of definitions in the source file via the Parser attribute .deforder
https://github.com/sphinx-doc/sphinx/blob/a605f2b61907ec768c79890b5073089c1931ac4e/sphinx/pycode/parser.py#L464
and orders attributes using this line where tagorder is the deforder above
https://github.com/sphinx-doc/sphinx/blob/a605f2b61907ec768c79890b5073089c1931ac4e/sphinx/ext/autodoc/__init__.py#L786

cheers,
alex

Start in numpydoc/docscrape.py at the two sorting points referenced in the issue, then compare Sphinx's Parser.deforder and autodoc ordering logic. Determine how autodoc_member_order reaches numpydoc and support the stated ordering modes without the current unconditional alphabetical ordering. Done means class attributes and methods follow the configured order.