Pymedio

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* Fix bug in ``DICOMDir.from_path`` where extension not properly formatted with list of paths.
* Fix readthedocs build.

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* Fix mutation issue; appeared to be because took a view of SimpleITK image instead of a copy
* Only support Python 3.9 (and greater when SimpleITK does so). It takes too long to support
old versions of Python, and the primary use case would be to support legacy systems,
e.g., for industry.

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* Copy when creating new ``BasicImage`` by default, because (unexpectedly) unsafe otherwise.

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* Copy when saving image because mutation occuring that makes it unsafe otherwise

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* Revert to use ``.view(np.ndarray)`` to fix accidental mutation of original array

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* Change ``to_npz`` method in ``BasicImage`` to use ``__array__`` to fix bug when saving slice
* Fix various mypy issues in the BasicImage stubs