feat(install): add --all-groups flag to install all dependency groups

[schneebuzz]

This PR adds the --all-groups flag to poetry install which includes all the dependency groups (including optional groups) for installation. This is a very common use case for projects with multiple optional groups and allows the user to install everything without specifying each group.

This feature has been discussed in the past. See e.g. #7605 and #5461. I gave it another shot with an implementation that respects the existing options and flags.

I decided not to go with --with=all or similar and instead use the explicit flag --all-groups, consistent with the --all-extras flag. A naming alternative would be --with-all.

Options like

• --all-groups --without=docs are supported,
• --all-groups --with=foo ignores the with with a warning,
• and --all-groups --only=foo results in an error.

Pull Request Check List

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

[schneebuzz]

Please review, feedback welcome.

[Secrus]

LGTM. @radoering, care to take a look?

[radoering]

I will take a look tomorrow.

[radoering]

LGTM. There is just one thing: python-poetry/poetry-plugin-export#294 introduces --all-groups to poetry export (not yet released). It is the same name; that is good. However, in poetry export --all-groups conflicts with --with and --without. I have no clear preference, but we should make it consistent.

[schneebuzz]

LGTM. There is just one thing: python-poetry/poetry-plugin-export#294 introduces --all-groups to poetry export (not yet released). It is the same name; that is good. However, in poetry export --all-groups conflicts with --with and --without. I have no clear preference, but we should make it consistent.

Thanks for reviewing.
Even though the all but without could be handy, I aligned with the referenced PR since it leaves less room for confusion.

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