[CONFIGURATION] File configuration - ostream exporter builders

[marcalff]

Contributes to #2481

This is a partial fix, to implement ostream exporter builders.

Changes

Please provide a brief description of the changes here.

• Implement ostream exporter builders

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[netlify]

✅ Deploy Preview for opentelemetry-cpp-api-docs canceled.

Name	Link
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.03%. Comparing base (f28ea95) to head (a2c65d9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3563   +/-   ##
=======================================
  Coverage   90.03%   90.03%           
=======================================
  Files         220      220           
  Lines        7069     7069           
=======================================
  Hits         6364     6364           
  Misses        705      705           

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[dbarker]

Looks good. Thanks! - minor nitpicks about potential to use rule of zero.