Compress protein text using bit packing (from 8 bits per char to 5 bits)

[SimonVandeVyver]

Implements bit packing to only use 5 bits per amino acid in the protein text. Since there are only 20 different amino acids, 5 bits (instead of the default 8 bits per character) are sufficient to represent each amino acid. This effectively reduces the size of the text with 37.5%. We use a bit array to represent the text.

[pverscha]

Looking good!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.18%. Comparing base (f15e3f8) to head (79bee50).
Report is 30 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #26      +/-   ##
===========================================
+ Coverage    94.92%   95.18%   +0.26%     
===========================================
  Files           18       18              
  Lines         1477     1350     -127     
===========================================
- Hits          1402     1285     -117     
+ Misses          75       65      -10     

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