Reduce memory allocation in cli.New

[FollowTheProcess]

• Add a benchmark for cli.New
• Reduce memory allocation in cli.New

Summary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.02%. Comparing base (3713af3) to head (3ef3121).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   93.04%   93.02%   -0.03%     
==========================================
  Files           7        7              
  Lines         949      946       -3     
==========================================
- Hits          883      880       -3     
  Misses         39       39              
  Partials       27       27              

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