Replace dsf::Size with std::size_t

[Grufoony]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.77%. Comparing base (d16d59c) to head (90f8d11).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
- Coverage   87.77%   87.77%   -0.01%     
==========================================
  Files          52       52              
  Lines        6323     6321       -2     
  Branches      701      701              
==========================================
- Hits         5550     5548       -2     
  Misses        754      754              
  Partials       19       19              

Flag	Coverage Δ
unittests	87.77% <100.00%> (-0.01%)	⬇️

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