Make ServiceEndpoint an interface in C# SDK #2231
Description
Is your feature request related to a problem? Please describe.
I'm trying to create unit tests to a custom router class that inherits EndpointRouterDecorator. In unit test I'd like to pass mocked ServiceEndpoint to test GetNegotiateEndpoint method to cover the cases where some endpoints are offline. However since ServiceEndpoint is not an interface, and its Online property is not virtual, I'm unable to create a mocked ServiceEndpoint that is offline using moq.
Describe the solution you'd like
Make ServiceEndpoint an interface and use it everywhere in the code base, or make Online property virtual.
Additional context
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