Add tutorials and usage examples

[j-adamczyk]

We should add example usage of molecular fingerprints, in particular:

1. Molecular property prediction (classification, regression, multioutput classification), with MoleculeNet and TDC benchmarks
2. Visualization and clustering
3. Virtual screening, e.g. with https://github.com/rdkit/benchmarking_platform

Those should also include computing fingerprints, tuning, and using parallelization. We should cover hashed fingerprints, descriptors, 3D variants with conformations etc.