perf: improve generate speed in watch mode

[sysulq]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 84.99%. Comparing base (f97bef9) to head (8c9e4c4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/kod/internal/generate.go	37.50%	3 Missing and 2 partials ⚠️
cmd/kod/internal/struct2interface.go	63.63%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
- Coverage   85.21%   84.99%   -0.22%     
==========================================
  Files          41       41              
  Lines        2137     2146       +9     
==========================================
+ Hits         1821     1824       +3     
- Misses        211      216       +5     
- Partials      105      106       +1     

Flag	Coverage Δ
unittests	84.99% <57.14%> (-0.22%)	⬇️

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