feat: optimize GetCallInfo with per-package sync.Pool caching

[oittaa]

Split out from #1467

Now also uses sync.Pool

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.47%. Comparing base (1216c9b) to head (577d4d6).
⚠️ Report is 168 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1481      +/-   ##
==========================================
+ Coverage   68.49%   69.47%   +0.97%     
==========================================
  Files          75       82       +7     
  Lines        4384     6608    +2224     
==========================================
+ Hits         3003     4591    +1588     
- Misses       1233     1793     +560     
- Partials      148      224      +76     

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