Add the 'hit callback' func

[SimFG]

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[codecov]

Codecov Report

Merging #542 (8ca4b88) into dev (be57ba2) will increase coverage by 0.00%.
Report is 2 commits behind head on dev.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #542   +/-   ##
=======================================
  Coverage   92.91%   92.92%           
=======================================
  Files          97       97           
  Lines        4249     4253    +4     
=======================================
+ Hits         3948     3952    +4     
  Misses        301      301           

Files Changed	Coverage Δ
gptcache/adapter/adapter.py	83.04% <100.00%> (+0.30%)	⬆️
gptcache/utils/__init__.py	89.34% <100.00%> (ø)