Add DiscreteVector operator access

[tpadioleau]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.11%. Comparing base (47e7bfc) to head (d69e472).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
include/ddc/chunk.hpp	75.00%	0 Missing and 2 partials ⚠️
include/ddc/chunk_span.hpp	0.00%	0 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (66.66%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #842      +/-   ##
==========================================
+ Coverage   89.99%   90.11%   +0.12%     
==========================================
  Files          55       55              
  Lines        2918     2925       +7     
  Branches      989      986       -3     
==========================================
+ Hits         2626     2636      +10     
  Misses         91       91              
+ Partials      201      198       -3     

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