[Feat][Doc] switch to poetry project for docs generating

[SemyonSinchenko]

Proposed changes

As discussed in #382

Checklist

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• [x] I have read the CONTRIBUTING doc
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• [x] Lint and unit tests pass locally with my changes
• [x] I have added tests that prove my fix is effective or that my feature works
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Further comments

Close #382

[acezen]

Hi, Sem, Can you update the document generation part in https://github.com/alibaba/GraphAr/blob/main/CONTRIBUTING.rst#how-to-generate-the-document to the latest generation process, including install dependencies through poetry.

[SemyonSinchenko]

Hi, Sem, Can you update the document generation part in https://github.com/alibaba/GraphAr/blob/main/CONTRIBUTING.rst#how-to-generate-the-document to the latest generation process, including install dependencies through poetry.

Did it.