put_file: default to overwrite=True

[pmrowla]

adlfs put_file() currently raises FileExistsError by default if the specified blob already exists. In version aware contexts put_file should default to succeeding even if the specified blob already exists, so that put_file creates a new version of the blob.

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I should also note that as far as I can tell every other fsspec put_file implementation defaults to overwriting an existing file, so I'm also wondering whether the current adlfs overwrite=False default should be changed in all contexts (regardless of whether or not the fs is version aware)?

[TomAugspurger]

Thanks for the PR.

I agree that we should match fsspec's default behavior here. I don't think this should depend on whether or not the filesystem is version aware or not.

And it's a bit of a hassle, but I think we should deprecate the current behavior first, by setting the default to None which means overwrite=False with a warning that it'll change to True in the future.

[TomAugspurger]

We can clean this up if we're just changing stuff to overwrite=True.

We'll need a note in the changelog. Maybe a versionchanged in the docstring too.

[pmrowla]

Updated the PR as requested