Support new recognizer hierarchy

[luhan2017]

Previously in BotFramework SDK, we only support two kinds of recognizers: LuisRecognizer and RegexRecognizer, users can choose either one of them to use in their bots. And also Composer don't support configure multiple language recognizers.

Now, there are some new recognier type introduced in the new SDK package,

• RecognizerSet
• CrossTrainedRecognizerSet
• QnAMakerRecognizer
• AdaptiveCardRecognzier
  Also, Composer needs to support multiple language scenarios.

Please refer to this doc to see how those recognizers work.

So here is our proposed recognizer hierarchy:

• we always had a RecognizerSet includes MutiLanguageRecongizer and AdaptiveCardRecognizer on the top.
• user need to config the default language, and for the locale don't a recognizer, it will fall back to default.
• under each local, there is a CrossTrainedRecognizerSet, user can add multiple SingleRecognizers under this.
• SingleRecognizers contains: LuisRecognizer, QnAMakerRecognizer, RegexRecognizer.

RecognizerSet: [
    {
        "$kind": "Microsoft.MultiLanguageRecognizer",
        "recognizers": [
            "en-us": {
                "$kind": "Microsoft.CrossTrainedRecognizerSet",
                "recognizers": [
                    "ToDoLuis.en-us.lu", //which maps to a AdaptiveLuisRecognizer
                    "ToDoLuis.en-us.qna", //which maps to a QnAMakerRecognizer
                    { "$kind": "Microsoft.RegexRecognizer"
                      "Intents": {...}
                    },
                    // add more SingleRecognizers (AdaptiveLuisRecognizer, QnAMakerRecognizer, RegexRecognzier)
                ]
            }
            "": {
                "$kind": "Microsoft.CrossTrainedRecognizerSet",
                "recognizers": [
                    "ToDoLuis.en-us.lu", //which maps to a AdaptiveLuisRecognizer
                    "ToDoLuis.en-us.qna", //which maps to a QnAMakerRecognizer
                    { "$kind": "Microsoft.RegexRecognizer"
                      "Intents": {...}
                    },
                    // add more SingleRecognizers (AdaptiveLuisRecognizer, QnAMakerRecognizer, RegexRecognzier)
                ]
            }
        ]
    },
    { "$kind": "Microsoft.AdaptiveCardRecognizer" }
]

Items to enable this new feature in Composer

• UX design.
• lubuild refactor.
• E2E integration.