Add suppport to configure a different Sizer for the batcher than the queue

[bogdandrutu]

Fixes #13313

[codecov]

Codecov Report

Attention: Patch coverage is 62.16216% with 14 lines in your changes missing coverage. Please review.

Project coverage is 91.48%. Comparing base (e8ccfc3) to head (910b123).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...orter/exporterhelper/internal/queuebatch/config.go	33.33%	8 Missing ⚠️
...rter/exporterhelper/internal/queuebatch/batcher.go	75.00%	3 Missing and 1 partial ⚠️
.../exporterhelper/internal/queuebatch/queue_batch.go	66.66%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (62.16%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13362      +/-   ##
==========================================
- Coverage   91.56%   91.48%   -0.09%     
==========================================
  Files         528      528              
  Lines       29472    29475       +3     
==========================================
- Hits        26985    26964      -21     
- Misses       1961     1981      +20     
- Partials      526      530       +4     

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