Auth flow support for adaptive cards (1.4) commands

[kaerm]

Add support for auth flow for the new Adaptive Cards components

OBI spec is here: microsoft/botframework-obi#128

Hacked up webchat that can do AC 1.4 cards: https://github.com/clearab/CateringDemo

Tracking status

.NET Issue

• [ ] PR
• [ ] Merged

JS Issue

• [ ] PR
• [ ] Merged

Java Issue

• [ ] PR
• [ ] Merged

Python Issue

• [ ] PR
• [ ] Merged

Docs

• [ ] PR
• [ ] Merged

[Stevenic]

I read through the auth portion of the spec and for composer I think we just need to update the AdaptiveCards package with a new action that calls the token service to see if there's a logged in user and grab the token.  This should only take a day if I can figure out how to test it.

[clearab]

This needs to be supported in the ActivityHandler side of the SDK as well.

[mrivera-ms]

Reviewed by the SDK team. Closing as Not Needed.

[clearab]

Need to determine which (if) channels are going to support this flow, and when, before we can determine priority.