Initial pass of adding the Teams packages into the build.

[cleemullins]

This PR adds 3 (currently empty) projects:

1. Microsoft.Bot.Builder.Teams
2. Microsoft.Bot.Connector.Teams
3. Microsoft.Bot.Schema.Teams

Each of these projects is configured for Stylecop and FxCop. Each one emits a (currently empty NuGet package, and has all the proper signing properties and properties set.

Next up, as part of this PR, is to make sure the CI system builds them and pushes the NuGet packages out to MyGet.

[coveralls]

Pull Request Test Coverage Report for Build 78463

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 352 unchanged lines in 52 files lost coverage.
• Overall coverage increased (+6.3%) to 80.364%

---

Files with Coverage Reduction	New Missed Lines	%
/libraries/integration/Microsoft.Bot.Builder.Integration.ApplicationInsights.Core/ApplicationBuilderExtensions.cs	1	71.43%
/libraries/Microsoft.Bot.Builder.AI.LUIS/LuisApplication.cs	1	95.45%
/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/PromptValidatorContext.cs	1	82.35%
/libraries/Microsoft.Bot.Builder.Dialogs/WaterfallStepContext.cs	1	86.96%
/libraries/Microsoft.Bot.Builder/TelemetryLoggerMiddleware.cs	1	57.58%
/libraries/Microsoft.Bot.Builder.Testing/XUnit/TestDataObject.cs	1	82.35%
/libraries/integration/Microsoft.Bot.Builder.Integration.AspNet.Core/HttpHelper.cs	2	90.91%
/libraries/integration/Microsoft.Bot.Builder.Integration.AspNet.Core/ServiceCollectionExtensions.cs	2	94.94%
/libraries/Microsoft.Bot.Builder/ActivityHandler.cs	2	8.33%
/libraries/Microsoft.Bot.Builder.AI.LUIS/Generator/DateTimeSpec.cs	2	64.29%

Totals
Change from base Build 78435:	6.3%
Covered Lines:	3401
Relevant Lines:	4232

---

💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.3.1