Add utility scripts to subset a HAL file

[twalsh-ebi]

Description

This PR would add two utility scripts which can be used to subset a HAL file.

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For code reviewers: code review SOP

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.77%. Comparing base (6088c4e) to head (e7362ff).
⚠️ Report is 8 commits behind head on release/116.

Additional details and impacted files

@@             Coverage Diff              @@
##           release/116     #972   +/-   ##
============================================
  Coverage        60.77%   60.77%           
============================================
  Files              210      210           
  Lines            22974    22974           
  Branches          3656     3656           
============================================
  Hits             13963    13963           
  Misses            7785     7785           
  Partials          1226     1226           

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