Expose bin_ptr() accessor wherever it makes sense

[robomics]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.08%. Comparing base (48341b4) to head (3d3e8ee).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...k/hic/include/hictk/hic/impl/block_reader_impl.hpp	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
- Coverage   85.10%   85.08%   -0.02%     
==========================================
  Files         120      120              
  Lines       10332    10335       +3     
==========================================
+ Hits         8793     8794       +1     
- Misses       1539     1541       +2     

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