PR READY: Add IBotTelemetryClient property into Dialog

[daveta]

Reviewed this with @johnataylor (sent mail to @Stevenic / @benbrown with no response yet), @gabog (and VA team), @ryanlengel (@darrenj 's team).

Issue

We need a way to log event data into Waterfall Dialog when:

• Preceding each step of waterfall
• When dialog completes (conversion)
• When dialog cancels.

Proposed change

Add a Logger property onto base Dialog.

Component Impact

Add new IBotTelemetryClient Logger { get; set; } property onto the base Dialog, so developers can access and log custom events from dialogs.
By default, the NullTelemetryClient will be used (no-op).

Customer Impact

No impact on existing SDK clients.

Tracking Status

Dotnet SDK

• PR
• Merged

Javascript SDK

• PR
• Merged

Java SDK

• PR
• Merged

Python SDK

• PR
• Merged

Emulator

• PR
• Merged

Samples

• PR
• Merged

Docs

• PR
• Merged

Tools

• PR
• Merged

[dcr]

[daveta]

Checked in..