DM-32467: Allow a Path object to be used in Butler constructor

[timj]

Checklist

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

[codecov]

Codecov Report

Merging #596 (c0c6a4d) into master (b48bc6e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #596   +/-   ##
=======================================
  Coverage   83.52%   83.53%           
=======================================
  Files         241      241           
  Lines       30275    30292   +17     
  Branches     4521     4522    +1     
=======================================
+ Hits        25286    25303   +17     
  Misses       3793     3793           
  Partials     1196     1196           

Impacted Files	Coverage Δ
python/lsst/daf/butler/_butlerConfig.py	94.87% <100.00%> (+0.13%)	⬆️
...thon/lsst/daf/butler/core/_butlerUri/_butlerUri.py	92.11% <100.00%> (+0.02%)	⬆️
tests/test_butler.py	97.51% <100.00%> (+0.02%)	⬆️
tests/test_uri.py	97.48% <100.00%> (+0.01%)	⬆️

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[mfisherlevine]

Looks great.