Add interface to RDKit

[padix-key]

As described in #709, this PR adds an interface to RDKit and also sets the design of other future biotite.interface subpackages. Let me know what you think, especially the design on the higher level (e.g. the @requires_version() decorator, adding packaging as dependency, the nomenclature with from_* and to_*)

@t0mdavid-m @JHKru @MaxGreil

[codspeed-hq]

CodSpeed Performance Report

Merging #736 will not alter performance

_{Comparing padix-key:rdkit (b84a7db) with main (886b446)}

Summary

✅ 59 untouched benchmarks