Ported test cases for adaptive dialogs

[chon219]

Description

Ported test cases for adaptive dialogs from botbuilder-dotnet
Fixed some bugs to make sure we can pass every tests.

Specific Changes

• Registered LG generators and selectors to let resource explorer load them from .dialog files
• Ported missing test cases for AdaptiveDialog
• Ported missing test cases for Selectors (except MostSpecificSelector as we don't have it yet)
• Ported MiscTests/SettingsStateTests

Testing

[coveralls]

Pull Request Test Coverage Report for Build 125194

• 17 of 17 (100.0%) changed or added relevant lines in 5 files are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.5%) to 79.706%

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Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-streaming/src/webSocket/webSocketTransport.ts	2	80.65%
libraries/botframework-streaming/src/webSocket/webSocketServer.ts	7	66.67%

Totals
Change from base Build 125027:	0.5%
Covered Lines:	12301
Relevant Lines:	14726

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💛 - Coveralls

[Stevenic]