Support Teams message edit, message soft delete, message undelete activities

[yingduyingdu]

This PR aims to extend the Bot SDK so that developers can consume newly added events that Teams will emit to the bot. They are:

TeamsMessageEdit - a user editing a message in Teams.
TeamsMessageUndelete - a user undo a deleted message in Teams.
TeamsMessageSoftDelete - a user soft deleting a message in Teams.

closes: https://github.com/microsoft/botbuilder-dotnet/issues/6565

Description

Extended ActivityHandler to handle MessageUpdate and MessageDelete activity types and dispatch functions for activity types.

Extended TeamsActivityHandler to handle MessageUpdate (with subtypes TeamsMessageEdit and TeamsMessageUndelete) and MessageDelete (with subtype TeamsMessageSoftDelete) teams events.

Specific Changes

ActivityHandler Class

• Added OnMessageUpdateActivityAsync method and OnMessageDeleteActivityAsync method

TeamsActivityHandler Class

• Overrided the above two methods and add logic based to eventType
• OnMessageUpdateActivityAsync could call OnTeamsMessageEditAsync or OnTeamsMessageUndeleteAsync
• OnMessageDeleteActivityAsync could call OnTeamsMessageSoftDeleteAsync

Testing

In ActivityHandlerTest class, added the following 2 unit tests

• TestMessageUpdateActivity
• TestMessageDeleteActivity

In TeamsActivityHandlerTests class, added the following 3 unit tests

• TestMessageUpdateActivityTeamsMessageEdit
• TestMessageUpdateActivityTeamsMessageUndelete
• TestMessageDeleteActivityTeamsMessageSoftDelete

[coveralls]

Pull Request Test Coverage Report for Build 331361

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 33 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+0.04%) to 79.102%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/integration/Microsoft.Bot.Builder.Integration.AspNet.Core/ServiceCollectionExtensions.cs	1	93.55%
/libraries/AdaptiveExpressions/BuiltinFunctions/StringTransformEvaluator.cs	1	83.33%
/libraries/Microsoft.Bot.Builder.LanguageGeneration/Evaluator.cs	1	95.42%
/libraries/Microsoft.Bot.Builder/Teams/TeamsActivityHandler.cs	3	78.23%
/libraries/Microsoft.Bot.Builder/ActivityHandler.cs	27	81.94%

Totals
Change from base Build 329938:	0.04%
Covered Lines:	25732
Relevant Lines:	32530

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💛 - Coveralls

[yingduyingdu]

@microsoft-github-policy-service agree [company="Microsoft"]

[yingduyingdu]

@microsoft-github-policy-service agree company="Microsoft"

[BruceHaley]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll