Wavelet packing

[NikolayMishukov]

Added support for serialization and fast deserialization of WaveletTree without copying the entire data into memory

[chatgpt-codex-connector]

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[codecov]

Codecov Report

❌ Patch coverage is 97.37991% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.17%. Comparing base (3fae9aa) to head (7da8614).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
include/pixie/bit_stream.h	86.95%	1 Missing and 2 partials ⚠️
include/pixie/wavelet_tree.h	98.37%	1 Missing and 1 partial ⚠️
include/pixie/bitvector.h	97.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   88.83%   89.17%   +0.33%     
==========================================
  Files          28       32       +4     
  Lines        8033     8423     +390     
  Branches     1323     1391      +68     
==========================================
+ Hits         7136     7511     +375     
- Misses        502      508       +6     
- Partials      395      404       +9     

Flag	Coverage Δ
gcov	89.17% <97.37%> (+0.33%)	⬆️

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[Malkovsky]

Please undo cmake formatting