[Improvement][.NET] Cache state store client in base connector

[timtay-microsoft]

Product

.NET SDK

Azure Iot Operations version

N/A

What happened?

In the connector worker class, when an asset attempts to forward a dataset with a destination of the state store, it creates and then disposes the state store client. We should probably just create this client once and cache it for later requests.

iot-operations-sdks/dotnet/src/Azure.Iot.Operations.Connector/ConnectorWorker.cs

Line 409 in f689997

await using StateStoreClient stateStoreClient = new(_applicationContext, _mqttClient);

List the steps to reproduce

No response

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