Normalize query vector in batch search cosine

[alonre24]

This include copying the blob when creating batch iterator (as currently we were relying on external buffer that may change).
Unit tests for Cosine were added to both indexes.

[codecov]

Codecov Report

Merging #144 (a0fd9c1) into main (b341bb7) will increase coverage by 0.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   92.29%   92.63%   +0.34%     
==========================================
  Files          39       39              
  Lines        1959     1969      +10     
==========================================
+ Hits         1808     1824      +16     
+ Misses        151      145       -6     

Impacted Files	Coverage Δ
.../VecSim/algorithms/brute_force/bf_batch_iterator.h	100.00% <ø> (ø)
src/VecSim/algorithms/brute_force/brute_force.h	100.00% <ø> (ø)
src/VecSim/algorithms/hnsw/hnsw_batch_iterator.h	100.00% <ø> (ø)
src/VecSim/algorithms/hnsw/hnsw_wrapper.h	100.00% <ø> (ø)
src/VecSim/vec_sim_index.h	100.00% <ø> (ø)
...ecSim/algorithms/brute_force/bf_batch_iterator.cpp	100.00% <100.00%> (ø)
src/VecSim/algorithms/brute_force/brute_force.cpp	99.47% <100.00%> (+1.63%)	⬆️
src/VecSim/algorithms/hnsw/hnsw_batch_iterator.cpp	100.00% <100.00%> (ø)
src/VecSim/algorithms/hnsw/hnsw_wrapper.cpp	97.02% <100.00%> (+1.93%)	⬆️
src/VecSim/batch_iterator.h	100.00% <100.00%> (ø)
... and 2 more

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[GuyAv46]

LGTM