Add original sample rate products and time buffer

[stoutta6]

Adding optional flag to create additional copies of all images using the original sample rate of the wav file. All bat call processing is still done on the standardized resampled data as before, and the results are referenced to the original sample rate STFT and/or interpolated as needed to create the new images.

Additionally, added optional time buffer (in ms) argument. The default of 1 ms corresponds to previous processing. To ensure bat calls are not chopped off, a 5 ms time buffer seems to work well.

[codecov]

Codecov Report

❌ Patch coverage is 93.93939% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.2%. Comparing base (740cba2) to head (a7d2732).

Files with missing lines	Patch %	Lines
batbot/spectrogram/__init__.py	93.8%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #43     +/-   ##
=======================================
+ Coverage   57.6%   59.2%   +1.6%     
=======================================
  Files          7       7             
  Lines       1322    1383     +61     
=======================================
+ Hits         762     820     +58     
- Misses       560     563      +3     

Files with missing lines	Coverage Δ
batbot/__init__.py	42.5% <100.0%> (ø)
batbot/spectrogram/__init__.py	70.3% <93.8%> (+1.4%)	⬆️

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[bluemellophone]

LGTM