feat: add `beforeHook` and `afterHook` spies

[danielroe]

related: https://github.com/unjs/hookable/issues/37

[codecov[bot]]

Codecov Report

Merging #46 (1cfc065) into main (5a46409) will increase coverage by 1.19%. The diff coverage is 95.23%.

:exclamation: Current head 1cfc065 differs from pull request most recent head 4797ce8. Consider uploading reports for the commit 4797ce8 to get more accurate results

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   96.91%   98.11%   +1.19%     
==========================================
  Files           4        4              
  Lines         227      265      +38     
  Branches       51       64      +13     
==========================================
+ Hits          220      260      +40     
+ Misses          7        5       -2     

Impacted Files	Coverage Δ
src/hookable.ts	98.23% <94.44%> (+0.40%)	:arrow_up:
src/utils.ts	96.61% <100.00%> (+4.15%)	:arrow_up:

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