Allow add to accept package name and version as a single string

[ulope]

• I have searched the issues of this repo and believe that this is not a duplicate.

Issue

Please allow add to accept the package name and version constraints in a single string. I.e. poetry add 'something>=2.1' instead of having to use poetry add 'something >=2.1'.

This is slightly related to #429 in that it would also reduce friction for people switching over from other tools (e.g. pip).

Also there is a slight documentation bug here: Neither the docs for the add command nor the command line help include any mention on how to specify version constraints in the first place.

[sdispater]

This is now possible in the latest beta release (see #1221 for more information).

[github-actions]

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