feat: add to_binary(), to_dict(), from_dict(); modify to_mol()

[isty2e]

Changelogs

• add datamol.convert.to_binary() using Mol.ToBinary()
• extend datamol.mol.to_mol() to accept a binary string as input
• add datamol.convert.to_dict() using rdkit.Chem.rdMolInterchange
• add datamol.convert.from_dict()
• add corresponding tests

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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 below.
• 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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Related to #230