Support more services in TrippinInMemory

[mirsking]

Description

• Rename Microsoft.OData.Service.Library to Microsoft.Restier.Providers.InMemory, since it is actually a new provider.
• In memory model's entity set won't be added into model automatically as EF, add them in RestierModelExtender.
• Add entity with collection of EdmStructuredObject ADD/UPDATE support.
• Add Etag support.
• Add Derived Entity ADD/UPDATE support.
• Add TrippinInMemory client for test.

Checklist (Uncheck if it is not completed)

• [ x ] Test cases added
• [ x ] Build and test with one-click build and test script passed

[msftclas]

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