DM-34208: Add getTraceLogger for obtaining a TRACEn logger

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Merging #121 (f471915) into main (c5abf31) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   91.69%   91.70%           
=======================================
  Files          42       42           
  Lines        2661     2664    +3     
=======================================
+ Hits         2440     2443    +3     
  Misses        221      221           

Impacted Files	Coverage Δ
python/lsst/utils/logging.py	84.55% <100.00%> (+0.38%)	⬆️

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