feat: Azure AI Language Orchestration Workflow Recognizer

[RadoslavGatev]

Purpose

This is a proposal for the implementation of #1551.

Changes

N/A

Tests

At this point only manual tests were done in Composer.

Feature Plan

[RadoslavGatev]

The majority of the code is based on the existing CLU recognizer and also uses some concepts from Custom Q&A recognizer. The code is not polished yet!

If you are willing to accept this PR, there are two options I can think of:

1. Leave it as a standalone recognizer named Microsoft.OrchestrationRecognizer
2. Merge it with Microsoft.CluRecognizer. But then the name of Microsoft.CluRecognizer likely needs to be changed to something else as it will work with both CLU and Orchestration Workflow type of projects.

Note: Orchestration Workflow might be a point of confusion with Orchestrator in Composer.