feat(io): merge dirwatch into file source

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 51.56250% with 31 lines in your changes missing coverage. Please review.

Project coverage is 71.32%. Comparing base (2f89c46) to head (6d8c723).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/io/file/source.go	50.79%	27 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3480      +/-   ##
==========================================
- Coverage   71.36%   71.32%   -0.05%     
==========================================
  Files         415      414       -1     
  Lines       47814    47707     -107     
==========================================
- Hits        34122    34023      -99     
+ Misses      11027    11021       -6     
+ Partials     2665     2663       -2     

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