Bytes based batching for profiles

[iblancasa]

Description

This PR implements serialized bytes based batching for metrics.

Link to tracking issue

#3262

Continuation of #12299 made by @sfc-gh-sili.

Related PRs:

• Bytes based batching for metrics #12550
• Bytes based batching for traces #12519

[codecov]

Codecov Report

Attention: Patch coverage is 85.49618% with 19 lines in your changes missing coverage. Please review.

Project coverage is 91.59%. Comparing base (da4512d) to head (ddedc5b).

Files with missing lines	Patch %	Lines
...r/exporterhelper/xexporterhelper/profiles_batch.go	86.59%	11 Missing and 2 partials ⚠️
pdata/pprofile/pb.go	40.00%	6 Missing ⚠️

❌ Your patch check has failed because the patch coverage (85.49%) 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   #12564      +/-   ##
==========================================
- Coverage   91.64%   91.59%   -0.06%     
==========================================
  Files         479      480       +1     
  Lines       26416    26487      +71     
==========================================
+ Hits        24210    24261      +51     
- Misses       1747     1766      +19     
- Partials      459      460       +1     

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[iblancasa]

@dmitryax @bogdandrutu