Allowed Paths to be used as inputs to HLAAlgorithm.use_config.

[rhliang]

Also updated some other places in the code to use Paths rather than just strings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8e95161) to head (e7f0c16).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          803       803           
  Branches       116       116           
=========================================
  Hits           803       803           

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