refactor: refine debug log for process kevent

[kanru]

Fixes #530

[codecov]

Codecov Report

❌ Patch coverage is 91.42857% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.02%. Comparing base (a4ed77a) to head (f5beceb).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/input.rs	91.17%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #775   +/-   ##
=======================================
  Coverage   92.01%   92.02%           
=======================================
  Files          37       37           
  Lines        9080     9114   +34     
=======================================
+ Hits         8355     8387   +32     
- Misses        725      727    +2     

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