ENH: Add API option --show-cache-dir

[scottclowe]

Tells the user where their cache directory is located.

[codecov]

Codecov Report

Base: 28.07% // Head: 28.17% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (21bcf87) compared to base (6e1579f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
+ Coverage   28.07%   28.17%   +0.09%     
==========================================
  Files          45       45              
  Lines        5346     5353       +7     
  Branches     1309     1310       +1     
==========================================
+ Hits         1501     1508       +7     
  Misses       3593     3593              
  Partials      252      252              

Flag	Coverage Δ
unittests	28.17% <100.00%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
echofilter/ui/checkpoints.py	36.62% <100.00%> (+1.89%)	⬆️
echofilter/ui/inference_cli.py	84.66% <100.00%> (+0.19%)	⬆️

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