DM-33085: Specify explicit caching option for SQLAlchemy classes

[andy-slac]

Suppresses warnings about missing caching attribute for some classes.

Checklist

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

[codecov]

Codecov Report

Merging #624 (4eaa635) into main (936d6f3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #624   +/-   ##
=======================================
  Coverage   84.08%   84.09%           
=======================================
  Files         237      237           
  Lines       30014    30023    +9     
  Branches     4990     4989    -1     
=======================================
+ Hits        25238    25247    +9     
  Misses       3638     3638           
  Partials     1138     1138           

Impacted Files	Coverage Δ
python/lsst/daf/butler/core/ddl.py	81.25% <100.00%> (+0.09%)	⬆️
...ython/lsst/daf/butler/registry/databases/sqlite.py	84.26% <100.00%> (ø)
...daf/butler/registry/queries/expressions/convert.py	80.87% <100.00%> (+0.49%)	⬆️

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[TallJimbo]

Looks good! I didn't dive into the SQLAlchemy docs to double-check your usage, though; if you were hoping I would do that, please just send it back to me.