feat: LuisAdaptiveRecognizer and test mocks

[chon219]

Fixes #3036
Fixes #3002
Fixes #3018

Description

Updated LuisAdaptiveRecognizer to use expression based configurations.

Specific Changes

• Updated LuisAdaptiveRecognizer to use expression based configurations.
• Added support for externalEntityRecognizer in LuisAdaptiveRecognizer
• Updated MockHttpRequestMiddleware to support mocking LUIS requests
• Updated LuisAdaptiveRecognizer to use v3 endpoint by default

Testing

Ported tests from C# repo.

[coveralls]

Pull Request Test Coverage Report for Build 548752815

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 43 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.1%) to 84.778%

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Files with Coverage Reduction	New Missed Lines	%
libraries/botbuilder-ai/src/luisRecognizerOptions.ts	1	81.82%
libraries/botbuilder-dialogs-adaptive/src/adaptiveDialog.ts	1	38.3%
libraries/botbuilder-dialogs-adaptive-testing/src/httpRequestMocks/httpRequestSequenceMock.ts	1	95.74%
libraries/botbuilder-dialogs-adaptive-testing/src/httpRequestMocks/httpResponseMockContent.ts	1	84.85%
libraries/botbuilder-dialogs-adaptive-testing/src/httpRequestMocks/sequenceResponseManager.ts	1	84.21%
libraries/botbuilder-ai/src/luisRecognizerOptionsV2.ts	2	94.85%
libraries/botbuilder-dialogs-adaptive/src/converters/recognizerConverter.ts	2	78.57%
libraries/botbuilder-dialogs-adaptive-testing/src/mocks/mockHttpRequestMiddleware.ts	2	86.84%
libraries/adaptive-expressions/src/triggerTrees/trigger.ts	4	60.47%
libraries/botbuilder-ai/src/luisRecognizer.ts	4	94.74%

Totals
Change from base Build 548641170:	-0.1%
Covered Lines:	18483
Relevant Lines:	20789

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💛 - Coveralls