fix: Rename all references from chains to chain

[FelixPetriconi]

ticket-1

[codecov]

Codecov Report

❌ Patch coverage is 99.29078% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.87%. Comparing base (0cc0f8b) to head (f38f4cf).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
test/segment_tests.cpp	97.67%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #12      +/-   ##
===========================================
- Coverage   100.00%   99.87%   -0.13%     
===========================================
  Files            3        7       +4     
  Lines          267      805     +538     
  Branches        27       43      +16     
===========================================
+ Hits           267      804     +537     
- Misses           0        1       +1     

Flag	Coverage Δ
Linux	99.20% <98.56%> (-0.80%)	⬇️
Windows	99.73% <98.48%> (-0.27%)	⬇️
macOS	99.21% <97.85%> (+0.17%)	⬆️

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