Calian updates to sdnotify

[zack-mayoh]

• Added/updated copyright info
• Renamed to async-sdnotify
• Updated type annotations
• Converted to Poetry project
• Wrote unit tests for 100% test coverage:

============================= test session starts ==============================
platform linux -- Python 3.11.7, pytest-8.3.3, pluggy-1.5.0 -- /home/mayoh/async-sdnotify/.venv/bin/python
cachedir: .pytest_cache
rootdir: /home/mayoh/async-sdnotify
configfile: pyproject.toml
plugins: asyncio-0.24.0, cov-5.0.0
asyncio: mode=Mode.STRICT, default_loop_scope=None
collecting ... collected 5 items

tests/test_systemdnotifier.py::test_does_nothing_without_environment PASSED [ 20%]
tests/test_systemdnotifier.py::test_connect_throws_exception_when_debug PASSED [ 40%]
tests/test_systemdnotifier.py::test_status_throws_exception_when_debug PASSED [ 60%]
tests/test_systemdnotifier.py::test_start_watchdog_throws_exception_when_debug PASSED [ 80%]
tests/test_systemdnotifier.py::test_sends_notifications PASSED           [100%]

---------- coverage: platform linux, python 3.11.7-final-0 -----------
Name                      Stmts   Miss  Cover
---------------------------------------------
aiosdnotify/__init__.py      82      0   100%
---------------------------------------------
TOTAL                        82      0   100%
Coverage XML written to file coverage.xml


============================== 5 passed in 1.06s ===============================
Finished running tests!

[bwillenborg]

Change asyncio.Task[Any] to asyncio.Task[None].