[WIP] Initial draft of python interface with pybind

[tbkr]

The current solution to expose a C-API and serve it via cffi to python is nice, although tedious, e.g. manual labor intense, solution. Due to C++ and Python being object oriented, the function/procedural C-API is a bit more verbose than wished. This leads to additional overhead when exposing new functionality, likewise when wrapping functional constructs.

This MR proposes the use of pybind11 to have a more convenient and expressive way of writing the transition layer between the C++ and Python-API.

This is WIP. I added a fdb_py.cc file containing all definitions for the C++-Python-Interaction, added the creation of the shared object file to CMake and added a pyproject.toml.

[FussyDuck]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}