Added Node and C# AdaptiveCardPrompt Samples

[mdrichardson]

Reference: microsoft/botframework-sdk#5396

Do not review AdaptiveCardPrompt.ts/cs. It will change. Please only review "bot code" for now, if anything.

...I'll have a separate PR for those and merge the finalized code into the sample (or it might be in the SDK by then)

Additional Details

Proposed Changes

Adds C# and Node Samples for using the un-merged AdaptiveCardPrompt

I numbered these Sample "09" because it seemed to make the most sense, but I'm very open to changing that, as well as the name.

These mostly follow the flow of current samples, but I originally created them in May, so I may have missed some design changes.

At some point, I may update this to show all of the functionality, but this is a good start while that gets fleshed out.

Notes

Both of these have class files for AdaptiveCardPrompt that are directly part of the sample (not in the SDK), since this is meant to be merged before we merge in AdaptiveCardPrompt

C# AdaptiveCardPrompt relies on a couple of pieces of the Dialogs package that are internal. It's modified a little in the sample so that the sample can stand on its own.

Node AdaptiveCardPrompt is a compiled version of adaptiveCardPrompt.ts and then edited a little for readability.

Testing

[mdrichardson]

Closing now that AdaptiveCardPrompt is in the Community Repos