feat: express existing thread safety (as most things are immutable)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Patch coverage: 91.11% and project coverage change: +0.05 🎉

Comparison is base (94706de) 88.56% compared to head (5067ba6) 88.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   88.56%   88.61%   +0.05%     
==========================================
  Files          19       19              
  Lines        8018     8037      +19     
==========================================
+ Hits         7101     7122      +21     
+ Misses        917      915       -2     

Impacted Files	Coverage Δ
src/mapper/altseq.rs	93.24% <ø> (ø)
src/static_data/mod.rs	100.00% <ø> (ø)
src/data/uta_sr.rs	57.31% <70.00%> (+2.99%)	⬆️
src/data/cdot/json.rs	93.52% <83.33%> (+0.02%)	⬆️
src/data/uta.rs	91.56% <100.00%> (+0.07%)	⬆️
src/mapper/alignment.rs	90.50% <100.00%> (+0.06%)	⬆️
src/mapper/assembly.rs	76.03% <100.00%> (+0.30%)	⬆️
src/mapper/variant.rs	90.73% <100.00%> (+0.03%)	⬆️
src/normalizer.rs	70.41% <100.00%> (+0.08%)	⬆️
src/validator/mod.rs	62.29% <100.00%> (ø)

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