[RELEASE] Release opentelemetry-cpp v1.23.0

[marcalff]

Fixes #3634

Changes

Please provide a brief description of the changes here.

• tbump 1.23.0
• complete missing CHANGELOG entries

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.11%. Comparing base (8f3ec92) to head (394dc5f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3660   +/-   ##
=======================================
  Coverage   90.11%   90.11%           
=======================================
  Files         221      221           
  Lines        7135     7135           
=======================================
  Hits         6429     6429           
  Misses        706      706           

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[marcalff]

Changelog added, now ready for review.

[lalitb]

Thanks.
Last minute addition if possible - #3651 - it's an important fix.