[csharp] add a callback-based ServiceClient API and a corresponding C# sample #2154
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Description
This PR introduces a new, callback-based variant of the service client call (CallWithCallback) alongside the existing CallWithResponse. It also adds or updates C# sample code to demonstrate the new API.
API Changes
ServiceClient(String^ serviceName)
allowing creation of a client without explicitly providing aServiceMethodInformationList^
.ServiceClient::CallWithCallback(String^ methodName, array<Byte>^ request, ResponseCallback^ callback, int timeoutMs)
to the C# wrapper.Sample Added