Masked spectrogram and mask output

[stoutta6]

Added masked spectrogram and mask image outputs when not in fast mode.

[stoutta6]

@bluemellophone Looks good to me, I added some conditionals to support fast mode

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.4%. Comparing base (570a97d) to head (a2ec490).

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #35     +/-   ##
=======================================
+ Coverage   56.7%   57.4%   +0.6%     
=======================================
  Files          7       7             
  Lines       1299    1317     +18     
=======================================
+ Hits         737     756     +19     
+ Misses       562     561      -1     

Files with missing lines	Coverage Δ
batbot/spectrogram/__init__.py	68.5% <100.0%> (+0.6%)	⬆️

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[bluemellophone]

LGTM