[Proposal] Add telemetry to ascertain usage of ApplicationInsights.ServiceFabric

[nizarq]

For telemetry generated / updated by AI.SF nuget, we need to have a way to mark it so that usage numbers can be ascertained.

[nizarq]

Mostly telemetry modules use the TelemetryContext.InternalContext.SdkVersion to identify which module / sdk version generated a given telemetry item. In the AI.SF case, we are actually mainly updating telemetry generted by other modules through the TelemetryInitializer, this means the sdk version is already set.
We have a few options:

1. Append some string to the existing string to add additional infomration.
2. Add a custom field indicating the data is coming from AI.SF
3. Evaluate the new and upcoming Health and Heartbeat feature to see if telemetry can be added using that.