Suppress initial interface down alarms with config option

[johannaengland]

Scope and purpose

Closes #257.

This is how I interpreted this issue: We have a config option that if it is set to true the first time a PortStateEvent would be created with the interface down state nothing happens instead.

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• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation
• Linted/formatted the code with black, ruff and isort, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See https://cbea.ms/git-commit/
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (e2164d5) to head (1409037).
Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #367   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files          77       77           
  Lines        9706     9711    +5     
=======================================
+ Hits         9576     9581    +5     
  Misses        130      130           

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[johannaengland]

Settings this to draft/blocked until we get more concrete specification on how this should work