Use Python styling conventions/linting

[pranasziaukas]

Since this is a hybrid project - both JS and Python - the Python side is left without any supervision when it comes to the code style.

There are already styling inconsistencies creeping into the code, like

./algo-core/onboarding.py:17:1: E302 expected 2 blank lines, found 1
./algo-core/onboarding.py:17:83: E231 missing whitespace after ','
./algo-core/onboarding.py:17:110: E202 whitespace before ')'
./algo-core/ortools_solver.py:646:21: E131 continuation line unaligned for hanging indent
./algo-core/scheduler_utils.py:45:121: E501 line too long (140 > 120 characters)
./algo-core/scheduler_utils.py:49:1: E302 expected 2 blank lines, found 1
./algo-core/scheduler_utils.py:55:1: E302 expected 2 blank lines, found 1
./algo-core/scheduler_utils.py:157:33: W292 no newline at end of file

I'd suggest running the black formatter as Alida used to do, by adding a developer dependency

poetry add --dev black

and formatting (from within the environment)

black --line-length 120 .

Or, even better, maybe it's possible to add

black --line-length 120 --check .

as part of the npm run lint so that it's checked automatically?

P.S. The black formatter is fully compatible with our internal Python CI pipeline.