Support `pip install .` to include tool.poetry.dev-dependencies

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Feature Request

It would be great if pip install . could pick up those dependencies under tool.poetry.dev-dependencies section.

The use case is to deploy a poetry managed app to a docker/CI environment without installing poetry, just plain pip install . in order to run uni-test.

[finswimmer]

Hello,

please use poetry export to create a requirements.txt which you can that use with pip.

fin swimmer

[sinoroc]

Some of us, in the larger Python packaging ecosystem make our dev dependencies optional with the extra feature. So that we can do python -m pip install .[dev] for example. I find it very practical.