Use file:// urls for path and directory dependencies

[dimbleby]

fixes python-poetry/poetry#5273

[radoering]

I wonder if this will break some "poetry-only" use cases where someone has a couple of projects relative to each other and everything works fine when the entire folder structure is moved.

Nevertheless, I think this fix is necessary because we are creating invalid PEP 508 names at the moment.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[gregtesseract]

@radoering Could you please make a new release.
Really keen on using this change.

[neersighted]

We are working on a new release (and it's linked here); as this will have to be coordinated with a Poetry release (and you, as a user of the poetry frontend won't benefit until it's shipped by Poetry), you can follow progress there.