Add spfresh

[robbespo00]

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

• max_posting_size: is the max allowed size for a posting list. By default is computed dynamically.
• min_posting_size: is the min allowed size for a posting list. By default is 10
• replicas: is the number of posting lists in which a vector will be added. By default is 8
• 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
• centroids_index_type: is the vector index to be used on centroids. It is an Enum and the only allowed values are HNSW and FLAT (by default it uses hnsw).
• 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 80.43478% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.68%. Comparing base (a226ea5) to head (f07d50d).
⚠️ Report is 10 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	88.00%	3 Missing ⚠️
weaviate/collections/classes/config.py	92.30%	1 Missing ⚠️
weaviate/collections/classes/config_vectors.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1848      +/-   ##
==========================================
- Coverage   86.86%   86.68%   -0.19%     
==========================================
  Files         273      273              
  Lines       19105    19725     +620     
==========================================
+ Hits        16596    17099     +503     
- Misses       2509     2626     +117     

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