Code quality improvements - adress findings from www.codefactor.io

[napetrov]

Please create PRs for addressing code quality issues reported by codefactor scans

https://www.codefactor.io/repository/github/oneapi-src/onedal

Some problems are simple fixes and i would expect that they can be fixed across entire repo and not one by one
Other might be super complex and i don't think can be fixed without serious refactoring - code complexity

[shekhar-chauhan]

@napetrov feel free to assign any of the refactoring issues to me and @saiteja13427, would be happy to contribute.

[Amruta789]

@napetrov I want to refactor the code, but can you tell me the testing procedure. Particularly I want to refactor those large number of if-elif conditions in /docs/dalapi/doxypy/parser/compound.py

[napetrov]

@shekhar-chauhan @Amruta789 - sorry, missed notifications here. Be free to raise PRs with fixes.