Select appropriate Python version from pyenv

[tmshn]

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Feature Request

As of 2020 (at least on macOS), the most convenient way to manage (install, list, etc) multiple versions of Python is by using pyenv (although we don't need some mechanism like shims).

It'd be like a charm if Poetry automatically looks for Python versions listed by pyenv and choose appropriate one based on constraint (choose the best one from pyenv versions list --bare if the command is available).

[tmshn]

Just made very rough version of PR to how it might work: #2566

[finswimmer]

At Poetry we try to avoid implementations specific for third-party tools. But maybe it's possible to implement it as a plugin. Or you give #4852 a try. Maybe this works as well :)

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