Line channel updates

[EricDahlvang]

Fixes microsoft/botframework-sdk#5316
and
microsoft/botframework-sdk#5313

OAuthPrompt (tested and works)

Dialogs Channel: added LIne
- SupportsSuggestedActions: 13
- SupportsCardActions: 99

Channel Constant: added Line

Add ChoicesChannelTests

[coveralls]

Pull Request Test Coverage Report for Build 52350

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 56 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.5%) to 76.0%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Builder.ApplicationInsights/BotTelemetryClient.cs	1	98.85%
/libraries/Microsoft.Bot.Builder.TemplateManager/DictionaryRenderer.cs	3	82.35%
/libraries/Microsoft.Bot.Builder.AI.LUIS/LuisPredictionOptions.cs	6	33.33%
/libraries/Microsoft.Bot.Builder.Dialogs/DialogContext.cs	9	76.15%
/libraries/Microsoft.Bot.Builder.TemplateManager/TemplateManager.cs	10	79.25%
/libraries/Microsoft.Bot.Builder.AI.LUIS/LuisRecognizer.cs	27	76.19%

Totals
Change from base Build 52064:	0.5%
Covered Lines:	4332
Relevant Lines:	5700

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💛 - Coveralls