add rdkit as a pypi dep

[hadim]

Changelogs

• Add rdkit as a pypi dep. Now possible after the rdkit conda package fix at Run pip install during the build to generate the dist-info folder and add support for rdkit-stubs conda-forge/rdkit-feedstock#143

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Checklist:

• Was this PR discussed in an issue? It is recommended to first discuss a new feature into a GitHub issue before opening a PR.
• Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• Update the API documentation is a new function is added, or an existing one is deleted.
• Write concise and explanatory changelogs above.
• If possible, assign one of the following labels to the PR: feature, fix or test (or ask a maintainer to do it for you).

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