feat(watchConfig): support hmr

[pi0]

Following up #77

This PR improves hooks with new acceptHMR lifecycle hook that allows handling config updates. Built-in getDiff uses ohash.diff internally to compare configs for easy implementation.

[codecov]

Codecov Report

Merging #78 (0f2f060) into main (9cd11ef) will decrease coverage by 1.48%.
The diff coverage is 45.00%.

❗ Current head 0f2f060 differs from pull request most recent head c7a0ca9. Consider uploading reports for the commit c7a0ca9 to get more accurate results

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   79.61%   78.14%   -1.48%     
==========================================
  Files           5        5              
  Lines         672      700      +28     
  Branches       64       64              
==========================================
+ Hits          535      547      +12     
- Misses        137      153      +16     

Impacted Files	Coverage Δ
src/watch.ts	36.95% <45.00%> (+1.50%)	⬆️

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