[Streaming Extensions] Updates to split Streaming Extensions library into two packages.

[DDEfromOR]

This PR moves the classes previously contained in the Microsoft.Bot.StreamingExtensions.Integration namespace to a newly created package named Microsoft.Bot.Builder.StreamingExtensions. These classes are used only by bots and cannot be included in the core StreamingExtensions library due to dependencies on Bot Builder.

[coveralls]

Pull Request Test Coverage Report for Build 70231

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.089%

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Totals
Change from base Build 69959:	0.0%
Covered Lines:	4963
Relevant Lines:	6438

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💛 - 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

[cleemullins]

Review + Changes made in person w/ Daniel