Add systemd notify helper module to common

Let's add a new module that wraps the systemd's notification channel.

References:

- Python wrappers\* https://github.com/bb4242/sdnotify
- https://github.com/stigok/sd-notify/blob/master/sd_notify.py
- We need to rewrite as an asyncio version.

- https://www.freedesktop.org/software/systemd/man/sd_notify.html# - detailed functionality documentation
We could use it to provide detailed status information to systemd and potentially the new watcher framework (OP#1058).Applying of the new module will be tracked with new issues.

JIRA Issue: BA-293

Start in the repository's common package and read the linked sdnotify and sd-notify Python wrappers alongside the systemd sd_notify documentation. Implement the requested asyncio-based notification module, with detailed status reporting as the target behavior; follow-up application work is explicitly tracked separately.

Written by the indexing model from the issue text.