Support multiple vectors for a single target

[dirkkul]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.51351% with 17 lines in your changes missing coverage. Please review.

Project coverage is 94.21%. Comparing base (6234608) to head (0449303). Report is 95 commits behind head on main.

Files	Patch %	Lines
weaviate/collections/grpc/query.py	85.48%	9 Missing :warning:
weaviate/collections/classes/grpc.py	87.09%	4 Missing :warning:
integration/test_named_vectors.py	92.85%	3 Missing :warning:
integration/test_collection_hybrid.py	90.90%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1235      +/-   ##
==========================================
- Coverage   94.42%   94.21%   -0.22%     
==========================================
  Files         215      219       +4     
  Lines       20686    21009     +323     
==========================================
+ Hits        19533    19793     +260     
- Misses       1153     1216      +63     

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