add directlinespeech support to prompts

[stevengum]

Fixes in JS: microsoft/botframework-sdk#5950

Description

Adds directlinespeech to channel.ts which determines the suggestedAction and cardAction support in the prompts.

The buttonCount limits follow Web Chat and Directline because this is in the context of Direct Line Speech via Web Chat.

Specific Changes

• Adds directlinespeech to channel.ts helper functions
• Add tests for channel.ts changes
• Regenerate botbuilder-dialogs.api.md

Testing

Unit tests and manually tested via 06.using-cards & 03.speech/a.direct-line-speech on chromium edge.

FYI @varunbmallik, @compulim, @NickEricson, @dmvtech

[coveralls]

Pull Request Test Coverage Report for Build 143669

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.07%) to 80.964%

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Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-streaming/src/webSocket/webSocketTransport.ts	2	80.65%
libraries/botframework-streaming/src/webSocket/webSocketServer.ts	7	66.67%

Totals
Change from base Build 143420:	-0.07%
Covered Lines:	12973
Relevant Lines:	15305

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💛 - Coveralls