Get real current notifications on macOS

[samschott]

Instead of getting delivered notifications from our cache, get them directly from macOS APIs.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.06%. Comparing base (26c6af2) to head (07b8fcd).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/desktop_notifier/backends/macos.py	71.42%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   85.13%   85.06%   -0.08%     
==========================================
  Files          10       10              
  Lines         895      904       +9     
==========================================
+ Hits          762      769       +7     
- Misses        133      135       +2     

Flag	Coverage Δ
pytest	85.06% <71.42%> (-0.08%)	⬇️

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