FEAT: add new parser LSlad

[TZ3070]

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Complete Description of Additions/Changes:

Add new parser LSlad

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.18%. Comparing base (11209f9) to head (9c4d00d).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
insights/parsers/ls.py	75.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4262   +/-   ##
=======================================
  Coverage   77.17%   77.18%           
=======================================
  Files         761      762    +1     
  Lines       41472    41496   +24     
  Branches     8763     8768    +5     
=======================================
+ Hits        32008    32029   +21     
- Misses       8407     8408    +1     
- Partials     1057     1059    +2     

Flag	Coverage Δ
unittests	77.17% <83.33%> (+<0.01%)	⬆️

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[xiangce]

Please file a Jira card for this new spec first. And please check if the local class FileListing can be used as base or not.

[TZ3070]

closed the PR, as will be using the ’ls -lan‘ instead.