[POC] exporter batcher - byte size based batching

[sfc-gh-sili]

Description

• Change to pdata. This PR adds the interface Size() to pdata.
  • See pdata/internal/cmd/pdatagen/internal/templates/message.go.tmpl
• Changes to exporter.request:
  • See exporter/exporterhelper/logs_batch.go shows the logic to split based on byte size.

Link to tracking issue

Fixes #

Testing

Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 5.88235% with 192 lines in your changes missing coverage. Please review.

Project coverage is 90.98%. Comparing base (306c939) to head (43e811c).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
exporter/exporterhelper/logs_batch.go	3.75%	77 Missing ⚠️
exporter/exporterbatcher/config.go	0.00%	8 Missing and 4 partials ⚠️
exporter/internal/queue/default_batcher.go	75.00%	2 Missing and 1 partial ⚠️
exporter/exporterhelper/internal/request.go	0.00%	2 Missing ⚠️
exporter/exporterhelper/logs.go	0.00%	2 Missing ⚠️
exporter/exporterhelper/metrics.go	0.00%	2 Missing ⚠️
exporter/exporterhelper/traces.go	0.00%	2 Missing ⚠️
...xporter/exporterhelper/xexporterhelper/profiles.go	0.00%	2 Missing ⚠️
pdata/pcommon/generated_instrumentationscope.go	0.00%	2 Missing ⚠️
pdata/pcommon/generated_resource.go	0.00%	2 Missing ⚠️
... and 43 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12017      +/-   ##
==========================================
- Coverage   91.70%   90.98%   -0.73%     
==========================================
  Files         455      455              
  Lines       24053    24253     +200     
==========================================
+ Hits        22058    22066       +8     
- Misses       1625     1812     +187     
- Partials      370      375       +5     

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