[BUILD] Add OTLP/file exporter for dll and examples

[owent]

Fixes #3225

Changes

• Add otlp for examples when include OTLP/file exporters only
• Link OTLP/file exporters into standardalone dll.

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.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.16%. Comparing base (3b89346) to head (c9474fb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3231   +/-   ##
=======================================
  Coverage   88.16%   88.16%           
=======================================
  Files         198      198           
  Lines        6224     6224           
=======================================
  Hits         5487     5487           
  Misses        737      737           

[marcalff]

LGTM, thanks for the fix.