PyOpenSci REVIEW - extract static classes and transfer to own modules

[Robaina]

This PR addresses one of the comments of reviewer @Batalex in PyOpenSci:

pynteny/parser.py

• The two classes in this file only use static methods and do not hold any attribute. Is there a reason for not replacing all those methods with simple functions?
  Edit: even preprocessing.py does isLegitSequence = RecordSequence.isLegitPeptideSequence

pynteny/app

• The embedded streamlit app is really cool fire
• There again, it seems a bit odd to have classes with only static methods

I guess I got caught up with the idea of using static classes to group functions. Makes more sense to write a module for each class since that is the pythonic way.

[codecov]

Codecov Report

Base: 86.70% // Head: 86.47% // Decreases project coverage by -0.24% ⚠️

Coverage data is based on head (e3dda80) compared to base (7eba519).
Patch coverage: 89.23% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   86.70%   86.47%   -0.24%     
==========================================
  Files          11       12       +1     
  Lines         820      806      -14     
==========================================
- Hits          711      697      -14     
  Misses        109      109              

Impacted Files	Coverage Δ
pynteny/parsers/syntenyparser.py	86.41% <86.41%> (ø)
pynteny/parsers/labelparser.py	91.66% <91.66%> (ø)
pynteny/preprocessing.py	90.24% <92.30%> (-0.19%)	⬇️
pynteny/filter.py	77.45% <100.00%> (ø)
tests/test_parser.py	96.77% <100.00%> (+0.10%)	⬆️
tests/test_preprocessing.py	98.00% <100.00%> (ø)
pynteny/parser.py

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