chore: add more test cases and refactoring

[iomz]

Add filtering cases and outsource the filter definitions from a config file.

[codecov]

Codecov Report

Merging #5 (d67988c) into main (178f132) will increase coverage by 90.58%.
The diff coverage is 96.92%.

@@            Coverage Diff             @@
##            main       #5       +/-   ##
==========================================
+ Coverage   6.33%   96.92%   +90.58%     
==========================================
  Files          1        1               
  Lines        363       65      -298     
==========================================
+ Hits          23       63       +40     
+ Misses       340        1      -339     
- Partials       0        1        +1     

Impacted Files	Coverage Δ
bibfuse.go	96.92% <96.92%> (ø)

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