[RELEASE] Release opentelemetry-cpp version 1.16.0

[marcalff]

Fixes #2688

Changes

Please provide a brief description of the changes here.

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 87.67%. Comparing base (497eaf4) to head (9bafac7).
Report is 89 commits behind head on main.

❗ Current head 9bafac7 differs from pull request most recent head fbd896c

Please upload reports for the commit fbd896c to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2711      +/-   ##
==========================================
+ Coverage   87.12%   87.67%   +0.55%     
==========================================
  Files         200      190      -10     
  Lines        6109     5853     -256     
==========================================
- Hits         5322     5131     -191     
+ Misses        787      722      -65     

see 107 files with indirect coverage changes