Introduce --additional-identifier flag

[HeavyWombat]

Add flag to between command to specified an additional custom
identifier for the named-entry list processing.

[codecov]

Codecov Report

Base: 82.24% // Head: 82.27% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (4956c3f) compared to base (92253fd).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   82.24%   82.27%   +0.02%     
==========================================
  Files          13       13              
  Lines        1307     1309       +2     
==========================================
+ Hits         1075     1077       +2     
  Misses        172      172              
  Partials       60       60              

Flag	Coverage Δ
unittests	82.27% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/dyff/core.go	88.33% <ø> (ø)
internal/cmd/between.go	86.36% <100.00%> (+0.31%)	⬆️
internal/cmd/common.go	73.56% <100.00%> (+0.30%)	⬆️

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