add --no-hardlinks option

[t-mangoe]

Description

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I added --no-hardlinks option.
This PR closes #440 issue.

• Relevant Issues : feature request: toggle output of link column in long format #440
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation

[codecov-commenter]

Codecov Report

Merging #499 (a7cb1cc) into main (d4e1f1c) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #499      +/-   ##
==========================================
+ Coverage   89.43%   89.61%   +0.18%     
==========================================
  Files           8        8              
  Lines         568      578      +10     
==========================================
+ Hits          508      518      +10     
  Misses         60       60              

Impacted Files	Coverage Δ
lib/colorls/core.rb	90.36% <100.00%> (+0.07%)	⬆️
lib/colorls/flags.rb	88.88% <100.00%> (+0.57%)	⬆️

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[avdv]

Thank you, LGTM. I just added a call to the newly introduced test/checks file, to have this covered there as well.