[sdk] Expose the ctor on Batch<T> which accepts a single item

[CodeBlanch]

To help resolve: open-telemetry/opentelemetry-dotnet-contrib#1814

Changes

• Expose the ctor on Batch<T> which accepts a single item for the batch.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.67%. Comparing base (6250307) to head (5935c0b).
Report is 250 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5642      +/-   ##
==========================================
+ Coverage   83.38%   85.67%   +2.29%     
==========================================
  Files         297      254      -43     
  Lines       12531    11037    -1494     
==========================================
- Hits        10449     9456     -993     
+ Misses       2082     1581     -501     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	85.64% <100.00%> (?)
unittests-Solution-Stable	85.67% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/OpenTelemetry/Batch.cs	96.18% <100.00%> (-1.36%)	⬇️

... and 113 files with indirect coverage changes

[CodeBlanch]

@reyang is going to explore doing something with attributes to allow users to opt-into having SimpleExportProcessor switch into a reentrant/non-blocking mode. Going to keep this in draft to give him time to investigate that and then we can decide which direction to take.

[reyang]

I have a different idea how to solve this (and a category of similar problems), check #5643.

[github-actions]

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[github-actions]

This PR was marked stale due to lack of activity and will be closed in 7 days. Commenting or Pushing will instruct the bot to automatically remove the label. This bot runs once per day.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.