refactor(build): change setup.py to pyproject.toml and supress cython warning

[hassec]

I was motivated to fix #289, but when starting to work on the old setup.py I was curious if you would be open to a bit of a modernisation, see below:

Changes in this PR:

• Move package/build configuration into a pyproject.toml following the adopted python standards.
• Only have a very minimal setup.py that translates omas_cython.pyx to omas_cython.c at the time the sdist package is created. This has the benefit that Cython is no longer a dependency for users. They *.c file still gets compiled during package install on the users computer, but that still is pretty quick and doesn't produce any warnings.

This PR also removes the need to manually traverse the file hierarchy to create packages and package_data lists. This is now automatically handled.

Editable installs still work by simply running:

pip install -e .

To build a sdist package using build run:

python -m build --sdist

from the root of the project. This creates an isolated virtual environment to build the sdist according to the spec in pyproject.toml.

[orso82]

We're certainly very open!!! Thank you @hassec for taking a deep dive into the setup files of OMAS!!

Perhaps @kalling can comment here. I have not kept up to date with the latest and greatest ways to setup a Python package.

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