Scanner: Use fsnotify

[Arthi-chaud]

Use fsnotify instead of polling events

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 46 lines in your changes are missing coverage. Please review.

Project coverage is 17.29%. Comparing base (0030b83) to head (4e9816c).

Files	Patch %	Lines
scanner/pkg/watcher/handle_event.go	0.00%	19 Missing ⚠️
scanner/pkg/watcher/watcher.go	0.00%	17 Missing ⚠️
scanner/app/main.go	0.00%	10 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main      #65       +/-   ##
===========================================
- Coverage   86.79%   17.29%   -69.50%     
===========================================
  Files          38       13       -25     
  Lines        2203      659     -1544     
===========================================
- Hits         1912      114     -1798     
- Misses        291      545      +254     

Flag	Coverage Δ
api	?
scanner	17.29% <0.00%> (?)

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