feat: support fileDir notify source

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 74.05063% with 41 lines in your changes missing coverage. Please review.

Project coverage is 71.16%. Comparing base (d2fe6b4) to head (2fd8f12).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/io/dirwatch/source.go	73.89%	31 Missing and 10 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #3380    +/-   ##
========================================
  Coverage   71.16%   71.16%            
========================================
  Files         406      407     +1     
  Lines       46406    46573   +167     
========================================
+ Hits        33023    33142   +119     
- Misses      10797    10834    +37     
- Partials     2586     2597    +11     

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