Support max batch size for logs

[gregoryfranklin]

Similar to #2422, this adds support for send_batch_max_size to batch processor for logs. Meaning this parameter is now supported for traces, metrics and logs (previously only traces and metrics were supported).

[bogdandrutu]

Please add a changelog entry

[codecov]

Codecov Report

Merging #2736 (39fc584) into main (8050a88) will decrease coverage by 0.04%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #2736      +/-   ##
==========================================
- Coverage   91.83%   91.79%   -0.05%     
==========================================
  Files         289      290       +1     
  Lines       15523    15563      +40     
==========================================
+ Hits        14256    14286      +30     
- Misses        870      879       +9     
- Partials      397      398       +1     

Impacted Files	Coverage Δ
processor/batchprocessor/batch_processor.go	84.49% <0.00%> (-5.59%)	⬇️
processor/batchprocessor/splitlogs.go	93.75% <93.75%> (ø)

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