Change Duration from string to TimeSpan in autogenerated internal class.

[cijothomas]

DependencyTelemetry has a public field Duration of type TimeSpan. This field is served by a string field leading to conversion between String and TimeSpan throughout the system.
https://github.com/Microsoft/ApplicationInsights-dotnet/blob/develop/src/Microsoft.ApplicationInsights/DataContracts/DependencyTelemetry.cs#L216

Proposal is to change the internal auto-generated code (https://github.com/Microsoft/ApplicationInsights-dotnet/blob/develop/Schema/PublicSchema/RemoteDependencyData.bond#L27) to use TimeSpan to avoid conversion between String and TimeSpan.

Applicable to DependencyTelemetry and RequestTelemetry.

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