Add poetry script to cover all included submodules in deps report

What does the merge request do?

This MR adds a poetry script which can list all deps required for all other modules as well as the local core modules.

This removes the tree version of the includes, which is not as useful and can't be merged easily.

Implementation notes

Summary for release notes

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Checklist

• Add unit tests (if applicable)
• Changes to inkex/ are well documented
• Clean merge request history