Make a proper Python wrapper over the library bindings

[Armavica]

Instead of calling directly the Rust bindings, I made a proper Python wrapper. This creates some verbosity but also gives more flexibility and avoids monkey-patching.

Fixes #37.

[Armavica]

@maurosilber I think it is okay to remove the rebop.pyi file now that the docstrings and types can be obtained statically from Python code, is that correct? Can you still see typehints and docstrings in Pylance on this branch?

[maurosilber]

Yes, that works with Pylance 👍

[Armavica]

Great, thank you very much for checking!