add multi2multivec-weaviate vectorizer

[augustas1]

Introducing multi2multivec-weaviate vectorizer.
Accepts only 1 image field when configuring vectorizer.

Module PR: weaviate/weaviate#9520

[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 61.53846% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.71%. Comparing base (bdc6481) to head (eea40b3).
⚠️ Report is 110 commits behind head on main.

Files with missing lines	Patch %	Lines
weaviate/collections/classes/config_vectorizers.py	60.00%	4 Missing ⚠️
weaviate/collections/classes/config_vectors.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1857      +/-   ##
==========================================
- Coverage   86.80%   86.71%   -0.10%     
==========================================
  Files         273      273              
  Lines       19059    19695     +636     
==========================================
+ Hits        16544    17078     +534     
- Misses       2515     2617     +102     

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[dirkkul]

Could you add a test under test/collection/test_config.py?

[databyjp]

Hey @dirkkul wdyt about this vs image_fields: list[str] for this context?

Per @augustas1 we expect only 1 image prop to be vectorized for this use context (image-based document retrieval). But just wanted to check for consistency with other modules & preserving optionality if we add other models.

[dirkkul]

Hey @dirkkul wdyt about this vs image_fields: list[str] for this context?

fine with me, we can always replace it it Union[str, list[str]] later without breaking anything