DM-36489: Add pgSphere support to obscore manager

[andy-slac]

Obscore manager adds generic plugin mechanisms to support spatial columns
and indices. A specific implementation using pgSphere extension adds
two columns and corresponding indices that contain pgSphere polygon and
position (center of bounding circle) to obscore table.

Checklist

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

[codecov]

Codecov Report

Base: 84.81% // Head: 84.82% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (cf37726) compared to base (8aa4553).
Patch coverage: 87.53% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #744      +/-   ##
==========================================
+ Coverage   84.81%   84.82%   +0.01%     
==========================================
  Files         254      257       +3     
  Lines       32980    33201     +221     
  Branches     5636     5662      +26     
==========================================
+ Hits        27972    28164     +192     
- Misses       3785     3805      +20     
- Partials     1223     1232       +9     

Impacted Files	Coverage Δ
python/lsst/daf/butler/datastores/fileDatastore.py	80.28% <ø> (ø)
...ython/lsst/daf/butler/registry/dimensions/table.py	94.68% <ø> (ø)
...sst/daf/butler/registry/interfaces/_collections.py	77.94% <ø> (ø)
...lsst/daf/butler/registry/queries/_query_backend.py	64.10% <ø> (ø)
...ython/lsst/daf/butler/registry/obscore/_spatial.py	69.76% <69.76%> (ø)
...ython/lsst/daf/butler/registry/obscore/_records.py	77.58% <73.33%> (-3.06%)	⬇️
...ython/lsst/daf/butler/registry/obscore/_manager.py	80.28% <81.25%> (-0.28%)	⬇️
...ython/lsst/daf/butler/registry/obscore/pgsphere.py	87.32% <87.32%> (ø)
...sst/daf/butler/registry/obscore/default_spatial.py	92.30% <92.30%> (ø)
tests/test_obscore.py	97.34% <97.18%> (-0.29%)	⬇️
... and 6 more

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[TallJimbo]

Looks good; just a few minor comments.

But codecov seems pretty convinced that your tests aren't actually exercising any of the pgSphere stuff, despite the tests' clear intent to do that. I suspect that means something's gone wrong in either the installation or the test-skipping logic.

[andy-slac]

But codecov seems pretty convinced that your tests aren't actually exercising any of the pgSphere stuff

I'm not sure that this is true. I checked build_and_test log and every PostgresPgSphereObsCoreTest is tagged as PASSED. Also this codecov page: https://app.codecov.io/gh/lsst/daf_butler/pull/744 shows that coverage is ~85% for pgsphere.py.