ENH: add support for loading Dataset from a pathlib.Path

[neutrinoceros]

This is a small cleanup I stumbled upon. My original motivation was more to cleanup the test than to add a feature, strange how things work out sometimes.

[VChristiaens]

Thanks for the PR @neutrinoceros. There seems to be a second part to this PR that is not really captured in the title if I'm not misatken. Could you expand on what's now done in the test_dataset.py test? In particular, is removing the temporary written file not needed any more?

[VChristiaens]

Hi @neutrinoceros, just following up quickly on this PR since it's pretty much mergeable. Before accepting it, I was just wondering what was the motivation for removing the line that remove the temporary file that is created and read in the test? I'd naively expect it to be a good thing to remove the unnecessary file created by the test - but maybe I'm missing something? Thanks again for all your contributions!

[neutrinoceros]

Sorry, this fell through the cracks of my backlog. I changed the test to use the native tmp_path pytest fixture, which handles resource destruction (i.e. cleaning up the temporary directory) itself, and in a more robust fashion: it'll clean it up even if the test fails on an assertion, while the pre-existing implementation wouldn't

[VChristiaens]

That's good to know - thanks a lot for this addition and for the clarification!