test(identity): add benchmark comparing es-toolkit and lodash

[umsungjun]

Added a benchmark test for the identity function to compare performance between es-toolkit and lodash.

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Name	Status	Preview	Comments	Updated (UTC)
es-toolkit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2025 9:55am

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.51%. Comparing base (cdfd65e) to head (6b55573). Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1197   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files         457      457           
  Lines        4331     4339    +8     
  Branches     1284     1286    +2     
=======================================
+ Hits         4310     4318    +8     
  Misses         21       21           

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