Bfloat16

[meiravgri]

Describe the changes in the pull request

A clear and concise description of what the PR is solving.

Which issues this PR fixes

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2. MOD...

Main objects this PR modified

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2. ...

Mark if applicable

• [ ] This PR introduces API changes
• [ ] This PR introduces serialization changes

[codecov[bot]]

Codecov Report

Attention: 160 lines in your changes are missing coverage. Please review.

Comparison is base (2295448) 95.60% compared to head (ababf61) 92.01%.

Files	Patch %	Lines
src/VecSim/spaces/IP/IP_AVX512_FP32.h	0.00%	61 Missing :warning:
src/VecSim/spaces/spaces.cpp	0.00%	26 Missing :warning:
.../VecSim/spaces/encoders/bf16/BF16_encoder_impl.cpp	50.00%	20 Missing :warning:
src/VecSim/spaces/IP/IP.cpp	0.00%	11 Missing :warning:
src/VecSim/spaces/IP/IP_AVX_FP32.h	0.00%	9 Missing :warning:
src/VecSim/spaces/IP/IP_SSE_FP32.h	0.00%	9 Missing :warning:
src/VecSim/utils/vec_utils.cpp	0.00%	8 Missing :warning:
src/VecSim/vec_sim_index.h	42.85%	8 Missing :warning:
src/VecSim/spaces/IP_space.cpp	64.70%	6 Missing :warning:
src/VecSim/index_factories/brute_force_factory.cpp	50.00%	1 Missing :warning:
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
- Coverage   95.60%   92.01%   -3.60%     
==========================================
  Files          65       67       +2     
  Lines        4093     4293     +200     
==========================================
+ Hits         3913     3950      +37     
- Misses        180      343     +163     

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