Store status notifications

[KoalaSat]

What does this PR do?

This PR introduces and refactors the notifications handling in backend, storing every single status change of the order to help manage better order changes in a future PR. The fact that they are stored with empty title helps to not display them in Android/Web notifications

The refactor also helps to understand when notifications are created

Checklist before merging

• [x] Install pre-commit and initialize it: pip install pre-commit, then pre-commit install. Pre-commit installs git hooks that automatically check the codebase. If pre-commit fails when you commit your changes, please fix the problems it points out.