Remove definition of Sizer from public API

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.67%. Comparing base (ccc1302) to head (01675db).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...rter/exporterhelper/internal/queuebatch/batcher.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14001      +/-   ##
==========================================
+ Coverage   91.65%   91.67%   +0.01%     
==========================================
  Files         654      654              
  Lines       42659    42626      -33     
==========================================
- Hits        39100    39076      -24     
+ Misses       2744     2738       -6     
+ Partials      815      812       -3     

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[bogdandrutu]

/easycla