Add support for new davinci model version

[byronvoorbach]

What's being changed:

Adds support for version 002 and 003 to the OpenAI text2vec and support for 003 to OpenAI QA

Review checklist

• Documentation has been updated, if necessary. Link to changed documentation:
• Chaos pipeline run or not necessary. Link to pipeline:
• All new code is covered by tests where it is reasonable.
• Performance tests have been run or not necessary.

[codecov]

Codecov Report

Base: 66.44% // Head: 66.47% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (698f607) compared to base (530bf59).
Patch coverage: 97.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2491      +/-   ##
==========================================
+ Coverage   66.44%   66.47%   +0.03%     
==========================================
  Files         571      572       +1     
  Lines       58341    58359      +18     
==========================================
+ Hits        38762    38792      +30     
+ Misses      17200    17190      -10     
+ Partials     2379     2377       -2     

Flag	Coverage Δ
integration	67.40% <ø> (+0.03%)	⬆️
unittests	53.21% <97.33%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
modules/qna-openai/config/class_settings.go	80.64% <ø> (ø)
usecases/replica/replicator.go	87.83% <ø> (+2.74%)	⬆️
usecases/traverser/explorer.go	56.17% <0.00%> (ø)
usecases/replica/finder.go	96.20% <95.23%> (-0.23%)	⬇️
...dules/text2vec-openai/vectorizer/class_settings.go	18.62% <100.00%> (+4.12%)	⬆️
usecases/replica/coordinator.go	100.00% <100.00%> (ø)
usecases/replica/resolver.go	100.00% <100.00%> (ø)
usecases/schema/get.go	59.42% <0.00%> (-4.22%)	⬇️
usecases/traverser/grouper/merge_group.go	77.29% <0.00%> (-1.32%)	⬇️
usecases/sharding/state.go	75.45% <0.00%> (+0.45%)	⬆️
... and 3 more

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