fix(pprof parsing): initialize function to zero values before parsing

[korniltsev]

before this change, when the parser is pooled if a function message has no some field it would reuse some garbage from previous pool usage

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
webapp/public/assets/app.js	1006.82 KB (0%)	20.2 s (0%)	3.7 s (-22.37% 🔽)	23.9 s
webapp/public/assets/app.css	19.88 KB (0%)	398 ms (0%)	0 ms (+100% 🔺)	398 ms
webapp/public/assets/styles.css	9.6 KB (0%)	192 ms (0%)	0 ms (+100% 🔺)	192 ms
packages/pyroscope-flamegraph/dist/index.js	632.77 KB (0%)	12.7 s (0%)	2 s (+0.15% 🔺)	14.7 s
packages/pyroscope-flamegraph/dist/index.node.js	633.47 KB (0%)	12.7 s (0%)	854 ms (+4.77% 🔺)	13.6 s
packages/pyroscope-flamegraph/dist/index.css	8.11 KB (0%)	163 ms (0%)	0 ms (+100% 🔺)	163 ms

[codecov]

Codecov Report

Base: 63.28% // Head: 63.28% // No change to project coverage 👍

Coverage data is based on head (0f885c4) compared to base (c84bcd3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1837   +/-   ##
=======================================
  Coverage   63.28%   63.28%           
=======================================
  Files         175      175           
  Lines        5912     5912           
  Branches     1587     1587           
=======================================
  Hits         3741     3741           
  Misses       2160     2160           
  Partials       11       11           

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