Chainable config files

[ClintonWB-EBSCO]

Resolves #682

PR to replace the single-file config load with a chainable config load.

New loader works on a pretty simple premise; at each depth, attempts to:

• For dict on dict, merge at any key
• For list on list, merge items with matching name, file_name, or fileName
• For other values/mismatch, overwrite with new value

[ClintonWB-EBSCO]

Test failing on #693 issues against the test tenant, seemingly unrelated to this PR.

[bltravis]

@ClintonWB-EBSCO Can you go ahead and rebase your branch to main? That should fix the test failures.

[codecov]

Codecov Report

Merging #692 (a7a9532) into main (39c4b5d) will increase coverage by 0.93%.
The diff coverage is 99.54%.

@@            Coverage Diff             @@
##             main     #692      +/-   ##
==========================================
+ Coverage   70.90%   71.83%   +0.93%     
==========================================
  Files         101      103       +2     
  Lines       11086    11264     +178     
  Branches     1337     1354      +17     
==========================================
+ Hits         7861     8092     +231     
+ Misses       2931     2878      -53     
  Partials      294      294              

Flag	Coverage Δ
unittests	71.83% <99.54%> (+0.93%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/folio_migration_tools/__main__.py	96.77% <100.00%> (+58.73%)	⬆️
src/folio_migration_tools/config_file_load.py	100.00% <100.00%> (ø)
tests/test_config_file_load.py	100.00% <100.00%> (ø)
tests/test_main.py	100.00% <100.00%> (ø)
...ation_tools/migration_tasks/migration_task_base.py	31.63% <0.00%> (-0.17%)	⬇️

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[bltravis]

Looks good.