feat: OpenAI Prompt Template support

[eisber]

What changes are proposed in this pull request?

Simplifies OpenAI Prompt engineering using PEP3101 string interpolation + output parsing.

How is this patch tested?

Unit tests.

Does this PR add a new feature? If so, have you added samples on website?

Not yet, in the works ;)

[github-actions]

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[eisber]

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[eisber]

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[codecov-commenter]

Codecov Report

Merging #1843 (304cb7f) into master (fbbb433) will decrease coverage by 1.22%.
The diff coverage is 57.64%.

@@            Coverage Diff             @@
##           master    #1843      +/-   ##
==========================================
- Coverage   86.84%   85.63%   -1.22%     
==========================================
  Files         297      299       +2     
  Lines       15422    15507      +85     
  Branches      784      783       -1     
==========================================
- Hits        13394    13280     -114     
- Misses       2028     2227     +199     

Impacted Files	Coverage Δ
...ure/synapse/ml/cognitive/openai/OpenAIPrompt.scala	30.00% <30.00%> (ø)
...rosoft/azure/synapse/ml/core/spark/Functions.scala	97.14% <97.14%> (ø)
...ft/azure/synapse/ml/causal/DoubleMLEstimator.scala	8.53% <0.00%> (-82.93%)	⬇️
.../azure/synapse/ml/causal/ResidualTransformer.scala	24.32% <0.00%> (-64.87%)	⬇️
.../synapse/ml/cognitive/openai/OpenAIEmbedding.scala	42.10% <0.00%> (-42.11%)	⬇️
...synapse/ml/cognitive/openai/OpenAICompletion.scala	29.41% <0.00%> (-35.30%)	⬇️
...oft/azure/synapse/ml/cognitive/openai/OpenAI.scala	53.19% <0.00%> (-26.96%)	⬇️
...osoft/azure/synapse/ml/causal/DoubleMLParams.scala	71.05% <0.00%> (-26.32%)	⬇️
...crosoft/azure/synapse/ml/io/http/HTTPClients.scala	77.94% <0.00%> (-4.42%)	⬇️
...oft/azure/synapse/ml/param/UntypedArrayParam.scala	53.12% <0.00%> (-3.13%)	⬇️
... and 3 more

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[eisber]

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[eisber]

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[eisber]

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[eisber]

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[eisber]

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[mhamilton723]

Lovely work! Thanks for the iterations!