feat: add OpenAICompletion model

[mhamilton723]

Summary

Add the OpenAI Text Completion cognitive service

Tests

See OpenAISuite.scala

Dependency changes

None

AB#1766734

[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-commenter]

Codecov Report

Merging #1495 (aac19a8) into master (7e877d6) will decrease coverage by 0.32%.
The diff coverage is 56.42%.

@@            Coverage Diff             @@
##           master    #1495      +/-   ##
==========================================
- Coverage   84.51%   84.18%   -0.33%     
==========================================
  Files         295      296       +1     
  Lines       14786    14923     +137     
  Branches      701      708       +7     
==========================================
+ Hits        12496    12563      +67     
- Misses       2290     2360      +70     

Impacted Files	Coverage Δ
.../org/apache/spark/ml/param/UntypedArrayParam.scala	63.15% <ø> (+5.26%)	⬆️
.../microsoft/azure/synapse/ml/cognitive/OpenAI.scala	55.22% <55.22%> (ø)
...re/synapse/ml/cognitive/CognitiveServiceBase.scala	75.57% <80.00%> (-0.40%)	⬇️
...org/apache/spark/ml/param/JsonEncodableParam.scala	84.21% <100.00%> (+0.87%)	⬆️
...ala/org/apache/spark/ml/param/DataFrameParam.scala	70.83% <0.00%> (-16.67%)	⬇️
...crosoft/azure/synapse/ml/io/http/HTTPClients.scala	66.17% <0.00%> (-10.30%)	⬇️
...se/ml/cognitive/MultivariateAnomalyDetection.scala	87.03% <0.00%> (-0.75%)	⬇️
...ft/azure/synapse/ml/cognitive/ComputerVision.scala	73.47% <0.00%> (-0.44%)	⬇️
...zure/synapse/ml/stages/PartitionConsolidator.scala	95.74% <0.00%> (+2.12%)	⬆️
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d6c67a3...aac19a8. Read the comment docs.