Create Generative xAI module

[erika-shorten]

Added the xAI generative module.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.42%. Comparing base (7d8afec) to head (c10a1f7).

Additional details and impacted files

@@             Coverage Diff              @@
##           dev/1.30    #1586      +/-   ##
============================================
+ Coverage     88.41%   88.42%   +0.01%     
============================================
  Files           190      191       +1     
  Lines         16708    16732      +24     
============================================
+ Hits          14772    14796      +24     
  Misses         1936     1936              

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[weaviate-git-bot]

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