Better example data

[mbsantiago]

Replaces the existing example dataset with 10 bat recordings sourced directly from Xeno-canto due to metadata issues with the previous data.
The selected recordings were originally uploaded to Xeno-canto by Daniel J Buckley and Gloriana Chaverri and are available under a Creative Commons By-NC-SA license. A LICENSE file has been added to reflect this.
Big thanks to Daniel J Buckley and Gloriana Chaverri for making their valuable data available on Xeno-canto!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.69%. Comparing base (326ccf3) to head (8a37027).
Report is 3 commits behind head on main.

Additional details and impacted files

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##             main      #35   +/-   ##
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  Coverage   60.69%   60.69%           
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  Files         179      179           
  Lines        8093     8093           
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  Hits         4912     4912           
  Misses       3181     3181           

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