Idea: add support for lock packages

[bneijt]

I'm currenlty exporting requirements in a package using a script based on poetry and the lock information.

I think this plugin would be a good place to add that functionality using --format wheel to create a package which depends on all lock versions. Often I get asked why not just use requirements.txt: python packages are more easily distributed though existing channels and my use-case requires me to ignore (not pin down) some parts of the depenency tree.

As this is the official export plugin, I would love to help integrate the logic from poetry-lock-packge into this plugin.

My current plugin implementation can be tracked here: https://github.com/bneijt/poetry-lock-package/pull/13