Support InChi as input for conformer generation

[danielhollas]

RDKit has an API for this so should be reasonably straightforward

https://www.rdkit.org/docs/source/rdkit.Chem.inchi.html

[danielhollas]

See also the InChI Web Demo, which generates InChi from drawn molecular structure.

https://iupac-inchi.github.io/InChI-Web-Demo/