MLOps for Custom Question Answering

[h2floh]

Added sample for Azure DevOps Pipelines based MLOps for Custom Question Answering service.

• bicep based IaC script to set up resources
• bash scripts to chain configuration parameters and secrets to Azure DevOps and setup all pipelines there
• Azure Pipelines orchestrating the important flows
  • Train, Score & Deploy
  • Rollback/PreviousVersion Deploy
  • Active Learning Suggestions Sync/Merge
• Accuracy test tool for scoring
• Python scripts to control MLOps processes via Custom Question Answering API
• Sample README including instructions and very short how it works (plan is to release a blog separately)
• Added new sample to Sample Overview README