Add default middleware to patch location of tenantId for MS Teams

[benbrown]

Fixes #884

Description

This change handles the in-transition locaiton of the tenant ID field for MS Teams.

Specific Changes

Load a middleware in the constructor for BotFrameworkAdapter that will look for channelData.tenant.id and copy the value to conversation.tenantId for use in createConversation.

Testing

• Unit tests have been updated
• Connect a bot to MS Teams, then use adapter.createConversation to create a DM with a user.

[benbrown]

NOTE: I fixed this with a middleware because it seemed like this was the LEAST disruptive place to put code that will only be needed until the protocol change happens.

The other possible place to do this would be inside processActivity, which seemed less good.

[coveralls]

Pull Request Test Coverage Report for Build #2212

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 88.276%

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Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-config/src/botConfigurationBase.ts	2	85.59%

Totals
Change from base Build #2206:	-0.01%
Covered Lines:	3241
Relevant Lines:	3528

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💛 - Coveralls

[tomlm]

🕐

All of Tom's feedback is taken, and he's busy - so I'm dismissing to Ben can merge once the build is passing.

[tomlm]