feat: support fileDir notify source

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.74830% with 43 lines in your changes missing coverage. Please review.

Project coverage is 71.15%. Comparing base (6e43915) to head (30b555b). Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/io/dirwatch/source.go	70.42%	31 Missing and 11 partials :warning:
internal/topo/planner/planner_source.go	66.67%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3380 +/- ## ========================================== + Coverage 71.00% 71.15% +0.15% ========================================== Files 400 407 +7 Lines 45349 46531 +1182 ========================================== + Hits 32200 33109 +909 - Misses 10606 10827 +221 - Partials 2543 2595 +52 ```

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