Group Logs and Spans by Resource and Instrumentation Scope in OTLP Exporter

[lalitb]

Changes

Refactor the log and span batching mechanism in the OTLP exporters to combine logs with the same resource and instrumentation scope before export.

Input:
(res1, lib1, log1), (res1, lib1, log2), (res1, lib2, log3), (res1, lib1, log4)

Output:
(res1, (lib1, (log1, log2, log4)), (lib2, (log3)))

The main changes include:
Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 95.14563% with 15 lines in your changes missing coverage. Please review.

Project coverage is 75.0%. Comparing base (b3315f2) to head (242d8ff).

Files	Patch %	Lines
opentelemetry-otlp/src/exporter/tonic/logs.rs	0.0%	7 Missing ⚠️
opentelemetry-otlp/src/exporter/http/mod.rs	0.0%	3 Missing ⚠️
opentelemetry-proto/src/transform/trace.rs	98.4%	3 Missing ⚠️
opentelemetry-otlp/src/exporter/http/logs.rs	0.0%	1 Missing ⚠️
opentelemetry-otlp/src/exporter/http/trace.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1873     +/-   ##
=======================================
+ Coverage   74.6%   75.0%   +0.3%     
=======================================
  Files        122     122             
  Lines      20001   20279    +278     
=======================================
+ Hits       14933   15212    +279     
+ Misses      5068    5067      -1     

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[ramgdev]

Looks good. Thanks for covering both logs and traces!