Implement meta::accumulate internal function

[sbaldu]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.72%. Comparing base (97dff19) to head (74d49e4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #316   +/-   ##
=======================================
  Coverage   95.72%   95.72%           
=======================================
  Files          53       53           
  Lines        1614     1614           
  Branches       88       88           
=======================================
  Hits         1545     1545           
  Misses         69       69           

Flag	Coverage Δ
unittests	95.72% <ø> (ø)

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Files with missing lines	Coverage Δ
include/CLUEstering/internal/meta/apply.hpp	100.00% <ø> (ø)

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