DM-42995: Add RemoteButlerRegistry

[dhirving]

Added a partial implementation of the registry property to RemoteButler. We now run the existing Registry test suite against RemoteButler's registry shim, by delegating unsupported methods to SqlRegistry via a new class HybridButlerRegistry.

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 95.49550% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 88.53%. Comparing base (75d9858) to head (95e3a90).

Files	Patch %	Lines
...on/lsst/daf/butler/tests/hybrid_butler_registry.py	95.23%	5 Missing ⚠️
python/lsst/daf/butler/remote_butler/_registry.py	95.83%	3 Missing ⚠️
tests/test_remote_butler.py	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #965      +/-   ##
==========================================
+ Coverage   88.49%   88.53%   +0.03%     
==========================================
  Files         310      312       +2     
  Lines       39783    39998     +215     
  Branches     8348     8363      +15     
==========================================
+ Hits        35206    35412     +206     
- Misses       3366     3376      +10     
+ Partials     1211     1210       -1     

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