Immitate `pip install --no-deps` / Add `--only-root`

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Feature Request

It would be great if Poetry could support installing only the root of the project, but leave all dependencies untouched, much like the --no-deps option to pip does.

The use case is a development environment where the code being worked on is spread across several packages, and I want to keep several of them editable in the same poetry environment without having to temporarily change/remove a dependency from pyproject.toml.

Poetry ould optionally still check whether the installed packages fulfill the dependencies or not, but with such an option that developers will explicitly use, this is not necessary I suppose.

[Natureshadow]

Well, this is a nice hack, but it would require one of manipulating pyproject.toml every time I start developing on such a situation, or forcing relative paths on every developer in the project (given that the library is, or might be, in a different Git repository/whatever).

[Maciej-Zwolinski]

Yet Another Use Case:

Since poetry does not recognize torch==1.10.2+cu113 as satisfying torch>=1.10.2 it’d be great to force poetry to ignore dependencies for packages that require specific versions of torch.