Nettacker code base major refactoring

[arkid15r]

Checklist

• I have followed the Contributor Guidelines.
• The code has been thoroughly tested in my local development environment with flake8 and pylint.
• The code is Python 3 compatible.
• The code follows the PEP8 styling guidelines with 4 spaces indentation.
• This Pull Request relates to only one issue or only one feature
• I have referenced the corresponding issue number in my commit message
• I have added the relevant documentation.
• My branch is up-to-date with the Upstream master branch.

Changes proposed in this pull request

This is a refactor of existing Nettacker code I've been working on recently.
The (incomplete) list of changes:

• add pre-commit checks
• apply OOP approach to the application architecture
• consolidate common modules logic into a base class
• extract YAML parsing logic into a separate module
• fix some typos
• get rid of (not all) misused try/except blocks
• migrate to poetry, remove requirements.* files
• re-design configuration module
• re-design logging module
• split application logic into classes
• use pathlib for path related manipulations
• use context-based naming for variables, modules, directories, etc
• use module level imports (vs function level)
• use the base class for specific protocol libraries