[WIP] chore(appender-tracing): move the appender-tracing code to the contrib repo

[bantonsson]

Fixes #
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[scottgerring]

@bantonsson this is for #3190 right?

[bantonsson]

@scottgerring Yes, but the other half in the contrib repo is not done yet.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.3%. Comparing base (51eac97) to head (2796636).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3194     +/-   ##
=======================================
- Coverage   80.7%   80.3%   -0.5%     
=======================================
  Files        126     125      -1     
  Lines      22397   21810    -587     
=======================================
- Hits       18089   17516    -573     
+ Misses      4308    4294     -14     

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