Add countdown utility class

[robamu]

No description provided.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (88f9ed9) 96.54% compared to head (58e44a5) 96.54%.

Files	Patch %	Lines
spacepackets/countdown.py	90.38%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   96.54%   96.54%   -0.01%     
==========================================
  Files          90       92       +2     
  Lines        7128     7214      +86     
==========================================
+ Hits         6882     6965      +83     
- Misses        246      249       +3     

Flag	Coverage Δ
unittests	96.54% <94.31%> (-0.01%)	⬇️

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