Add generative openai support

[dirkkul]

Adds support for generative search via openai

usage:

    result = (
        client.query.get(*Class* [*Props*])
        .with_generate(
            single_prompt="Some prompt",
            grouped_task="Some task",
        )
        .do()
    )

At least one of the two parameters has be given

[byronvoorbach]

LGTM!

[codecov-commenter]

Codecov Report

Base: 96.35% // Head: 96.07% // Decreases project coverage by -0.29% ⚠️

Coverage data is based on head (7dfefe8) compared to base (3d66fb7).
Patch coverage: 80.95% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
- Coverage   96.35%   96.07%   -0.29%     
==========================================
  Files          60       60              
  Lines        7081     7185     +104     
==========================================
+ Hits         6823     6903      +80     
- Misses        258      282      +24     

Flag	Coverage Δ
unittests	96.07% <80.95%> (-0.29%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
test/connection/test_connection.py	91.89% <ø> (ø)
weaviate/client.py	98.30% <ø> (ø)
weaviate/wcs/crud_wcs.py	98.50% <ø> (ø)
integration/test_graphql.py	87.50% <42.85%> (-12.50%)	⬇️
integration/test_authentication.py	89.09% <57.89%> (-6.52%)	⬇️
weaviate/util.py	95.85% <63.63%> (-2.25%)	⬇️
weaviate/connect/connection.py	90.05% <68.00%> (-3.66%)	⬇️
test/gql/test_get.py	100.00% <100.00%> (ø)
test/test_client.py	100.00% <100.00%> (ø)
test/test_version.py	100.00% <100.00%> (ø)
... and 10 more

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