refactor: move decode and unfilter methods to separate files

[targos]

No description provided.

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (98c771e) 91.38% compared to head (7016692) 91.54%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/helpers/unfilter.ts	74.07%	14 Missing ⚠️
src/helpers/decodeInterlaceNull.ts	89.13%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   91.38%   91.54%   +0.16%     
==========================================
  Files           7        9       +2     
  Lines         418      426       +8     
  Branches       84       84              
==========================================
+ Hits          382      390       +8     
  Misses         36       36              

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