DM-39915: Use new datastore roots API and add ruff configuration

[timj]

Relies on lsst/daf_butler#862

Checklist

• added documentation for a new migration script

[codecov-commenter]

Codecov Report

Merging #24 (f4dd2dc) into main (7c1fc12) will decrease coverage by 0.50%.
The diff coverage is 63.63%.

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@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   56.46%   55.96%   -0.50%     
==========================================
  Files          32       32              
  Lines        1114     1106       -8     
  Branches      254      254              
==========================================
- Hits          629      619      -10     
- Misses        451      453       +2     
  Partials       34       34              

Impacted Files	Coverage Δ
...ython/lsst/daf/butler_migrate/butler_attributes.py	61.22% <ø> (ø)
...lsst/daf/butler_migrate/script/migrate_add_tree.py	26.66% <ø> (ø)
...lsst/daf/butler_migrate/script/migrate_revision.py	18.51% <0.00%> (-1.49%)	⬇️
...on/lsst/daf/butler_migrate/script/migrate_trees.py	14.63% <0.00%> (-2.04%)	⬇️
...f/butler_migrate/script/rewrite_sqlite_registry.py	19.79% <0.00%> (-1.27%)	⬇️
tests/test_database.py	96.96% <ø> (ø)
tests/test_digests.py	92.00% <ø> (ø)
tests/test_migrate.py	95.00% <ø> (ø)
...daf/butler_migrate/script/migrate_set_namespace.py	30.00% <50.00%> (-3.34%)	⬇️
python/lsst/daf/butler_migrate/config.py	72.09% <100.00%> (ø)
... and 7 more

[andy-slac]

Looks great, thanks for cleaning this neglected package!