Add Hfresh index type

[robbespo00]

It allows to create HFresh index. Currently users can set the following parameters:

• max_posting_size_kb: is the max allowed size for a posting list. By default is computed dynamically.
• replicas: is the number of posting lists in which a vector will be added. By default is 4
• rng_factor: is a factor used to add a vector to a posting list if it's too close to a selected posting list then it will be skipped. By default is 10
• search_probe: is the number of posting lists to search. By default is 64
• distance_metric: is the distance metric used to compute distances. By default is cosine
  If a parameter is not set then the default one will be used.

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[codecov-commenter]

Codecov Report

❌ Patch coverage is 73.68421% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.36%. Comparing base (fd58638) to head (d4baec8).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
weaviate/collections/classes/config_methods.py	20.00%	4 Missing ⚠️
...eaviate/collections/classes/config_vector_index.py	82.35%	3 Missing ⚠️
weaviate/collections/classes/config.py	84.61%	2 Missing ⚠️
weaviate/collections/classes/config_vectors.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1848      +/-   ##
==========================================
- Coverage   86.45%   86.36%   -0.09%     
==========================================
  Files         274      274              
  Lines       19966    20015      +49     
==========================================
+ Hits        17261    17286      +25     
- Misses       2705     2729      +24     

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