.Net: ONNX 0.5.0 Add Ogahandle resource managment to Service [WIP]

[RogerBarreto]

Motivation and Context

• The Latest 0.5.0 package also requires the caller to handle the resources with the OgaHandler instance, when a service is instantiated this resource needs to be also present and exposed together with the service. Otherwise a message will be sent to the console and the application will crash before finishing.

• Resolves .Net: Bug: Application crashes when using the ONNX connector and OnnxRuntimeGenAI v0.5.0 package #9628

[f2bo]

Doesn't this change mean that the model is reloaded into memory every time that you run an inference? This might take several seconds each time.

On the other hand, isn't having multiple OgaHandles, one for each service instance, a problem? It's not guaranteed that you will only have a singleton instance and disposing of one of the ONNX services will shut down the ONNX runtime for the process, so that all other services become invalid.
On the other hand, isn't creating multiple OgaHandles, one for each invocation of the service, a problem? The handle is disposed after the first invocation, which will shut down the ONNX runtime for the process and as a result, any subsequent invocations should fail.

[RogerBarreto]

@f2bo This won't be merged as is, I will add some extra Unit Testing to ensure it doesn't affect the status-quo, for the moment recommend using the ONNX Connector with previous version of GenAI.