port: Add support of Expressions in BeginDialog Actions

[chon219]

Fixes #3418

Description

Add support of Expressions in BeginDialog Actions.

Specific Changes

• Implemented DialogSetConverter

Testing

Ported tests.

[coveralls]

Pull Request Test Coverage Report for Build 700063823

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 174 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 84.943%

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Files with Coverage Reduction	New Missed Lines	%
libraries/botbuilder-dialogs-adaptive/src/adaptiveDialog.ts	174	38.3%

Totals
Change from base Build 699656075:	0.05%
Covered Lines:	18895
Relevant Lines:	21181

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💛 - Coveralls

[chon219]

It is so weird that tests will fail on Windows for 'bf' is not recognized as an internal or external command, operable program or batch file., do you know why? @joshgummersall

[joshgummersall]

@chon219 in order to get the tests to pass, run yarn test:schema locally and commit the changes to the test schema file.

[chon219]

@chon219 Zichuan Ma FTE in order to get the tests to pass, run yarn test:schema locally and commit the changes to the test schema file.

Got it, thanks.