Improve performance of hictk zoomify when processing .hic files

[robomics]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 46.15385% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 84.83%. Comparing base (7419e5c) to head (16a20cc).

Files	Patch %	Lines
...k/hic/include/hictk/hic/impl/file_zoomify_impl.hpp	46.15%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
- Coverage   84.89%   84.83%   -0.07%     
==========================================
  Files         115      115              
  Lines        9329     9341      +12     
==========================================
+ Hits         7920     7924       +4     
- Misses       1409     1417       +8     

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