Add support for PyPI API tokens

[sdispater]

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code.

PyPI recently added support for token-based authentication to upload packages: https://pypi.org/help/#apitoken

This PR adds support for that use case in Poetry.

Users can now configure tokens via the config command:

poetry config pypi-token.pypi my-token

It's also possible to provide an environment variable holding the value of the token:

export POETRY_PYPI_TOKEN_PYPI=my-token

[danieleades]

just for some clarification, is this intended to support token-based authentication on alternative pypi registries, or only the public registry?

I can confirm that i can add packages from my local (artifactory) pypi registry using username/password auth, but not with an API key

[github-actions]

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