Add support for project-specific "default"/"self" configuration

[BEllis]

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the FAQ and general documentation and believe that my question is not already covered.

Feature Request

As a developer, I am wanting to have some poetry plugins loaded only for certain projects I have on my development machine and may also want to change other poetry settings between projects (i.e. do or don't create virtual environments).

I propose that poetry will look for a .poetry directory in the current working directory, if present, it will use this over the default system config location. I'd expect POETRY_CONFIG_PATH env var to take precedence over the .poetry

It could be initialized by running a new init self command, something like

poetry self init

Running this command would create a .poetry directory in the current working directory and generate the necessary default files (config.toml, pyproject.toml, poetry.lock)

This would enable me as a developer to do the following,

poetry self init
poetry self add my-poetry-plugin

and by including the .poetry directory in git, it would mean the dependency/usage of a poetry plugin would be automatically picked up by other developers (though they would probably still need to run poetry self install, not sure if this can happen implicitly elsewhere TBD)

[Secrus]

You can have per-project config just by using poetry.toml file. As to per-project plugins (and dev tools), we have #5740, which I am going to be working on after finishing #5509.

[BEllis]

@Secrus

The project-level pyproject.toml / poetry.toml isn't currently used by self commands as far as I can see?

This feature request is slightly more generalised than #5740

Although the main benefit I want is fulfilled by #5740 this feature feels useful also?

I've raised a draft PR which appears to be working and doing what I've described above.

[Secrus]

The PR you prepared is not viable. self namespace is meant as a way to manage the installation of Poetry on your system, not for any kind of per-project commands.

[Secrus]

After discussion, core maintainers decided that this request will be rejected.

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