feat(list): first version of deque as fork from container/list (#45).

[fgm]

• includes 100% test coverage and cmd/ demo with tests.

Close #45

[codecov]

Codecov Report

❌ Patch coverage is 98.27586% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.23%. Comparing base (95d165f) to head (b4224ab).

Files with missing lines	Patch %	Lines
cmd/list/real_main.go	90.90%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   98.22%   98.23%   +0.01%     
==========================================
  Files          15       17       +2     
  Lines         451      567     +116     
==========================================
+ Hits          443      557     +114     
- Misses          6        7       +1     
- Partials        2        3       +1     

Flag	Coverage Δ
unittests	98.23% <98.27%> (+0.01%)	⬆️

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