Make moduleconfig optional for custom reranker/generative

[dirkkul]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.56%. Comparing base (42fb96c) to head (ffe9afc).
Report is 102 commits behind head on main.

Files	Patch %	Lines
weaviate/collections/classes/config.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1187      +/-   ##
==========================================
- Coverage   94.68%   94.56%   -0.13%     
==========================================
  Files         190      193       +3     
  Lines       18932    19250     +318     
==========================================
+ Hits        17926    18203     +277     
- Misses       1006     1047      +41     

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