This commit makes the build of Python packages use `setuptools` instead
of the deprecated `distutils` in `setup.py` files. See
[PEP 632](https://peps.python.org/pep-0632/) for more information on the
deprecation of `distutils`.

Note that using `setuptools` instead of `distutils` removes the
following user warning messages when creating the `bdist` and `sdist` of
the consumer and producer projects:

```
/usr/lib/python3.8/distutils/dist.py:274: UserWarning: Unknown distribution option: 'setup_requires'
  warnings.warn(msg)
/usr/lib/python3.8/distutils/dist.py:274: UserWarning: Unknown distribution option: 'install_requires'
  warnings.warn(msg)
```

Move part related to broker request to common. Switch get requests for producer from receiver to broker

Error message:

> main_eventmon.cpp:109:17: error: ‘int siginterrupt(int, int)’ is deprecated: Use sigaction with SA_RESTART instead [-Werror=deprecated-declarations]

The migration from deprecated `siginterrupt(SIGINT, 1)` to `sigaction` is
inspired by the migration done in CPython, see
https://github.com/python/cpython/commit/f9c5e3f5f61cd380f8a17c814766fc3730b7fbdf

This includes read-only buffers.

The code split between bytes and numpy array is removed and all objects
are now handled equally.

Furthermore, it seems to be more correct to increase the ref count for
None objects as well, while a pointer to that object is used.