Update adapters for Skills compatibility

[garypretty]

#3147 - Added additional ContinueConversationAsync overload for custom adapters for skills compatibility.
#3146 - Move 'BotIdentityKey' const to BotAdapter and made it public.

[coveralls]

Pull Request Test Coverage Report for Build 96155

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1913 unchanged lines in 243 files lost coverage.
• Overall coverage increased (+0.2%) to 78.297%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/Adapters/Microsoft.Bot.Builder.Adapters.Facebook/FacebookAdapterOptions.cs	1	86.67%
/libraries/integration/Microsoft.Bot.Builder.Integration.ApplicationInsights.Core/ApplicationBuilderExtensions.cs	1	71.43%
/libraries/Microsoft.Bot.Builder.AI.LUIS/LuisApplication.cs	1	96.36%
/libraries/Microsoft.Bot.Builder.AI.LUIS/V3/LuisApplication.cs	1	96.43%
/libraries/Microsoft.Bot.Builder.AI.LUIS/V3/LuisUtil.cs	1	96.35%
/libraries/Microsoft.Bot.Builder/BotStateSet.cs	1	85.0%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/BaseInvokeDialog.cs	1	87.5%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/Case.cs	1	87.5%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/EditActions.cs	1	93.75%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/EndTurn.cs	1	81.82%

Totals
Change from base Build 96073:	0.2%
Covered Lines:	13287
Relevant Lines:	16970

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Integration.ApplicationInsights.Core.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Integration.AspNet.Core.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Testing.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Streaming.dll compared against version 4.6.3

[tomlm]