Open AI module: provide API key at query time

[antas-marcin]

Closes #1816

[codecov]

Codecov Report

Merging #1817 (5644787) into master (4155ff2) will decrease coverage by 0.01%.
The diff coverage is 55.17%.

@@            Coverage Diff             @@
##           master    #1817      +/-   ##
==========================================
- Coverage   66.27%   66.26%   -0.02%     
==========================================
  Files         399      399              
  Lines       29832    29858      +26     
==========================================
+ Hits        19770    19784      +14     
- Misses       8342     8355      +13     
+ Partials     1720     1719       -1     

Flag	Coverage Δ
integration	67.74% <ø> (+0.01%)	⬆️
unittests	66.26% <55.17%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
adapters/handlers/rest/middlewares.go	0.00% <0.00%> (ø)
adapters/handlers/rest/embedded_spec.go	100.00% <100.00%> (ø)
modules/text2vec-openai/clients/vectorizer.go	65.00% <100.00%> (+9.68%)	⬆️
adapters/repos/db/aggregator/text.go	80.00% <0.00%> (-3.08%)	⬇️
usecases/sharding/state.go	66.01% <0.00%> (-0.98%)	⬇️
adapters/repos/db/shard_write_batch_objects.go	79.06% <0.00%> (+3.10%)	⬆️

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