Provide a NuGet-Package with TestMocksRepository to enable Unit-Tests.

[MartinDemberger]

Is your feature request related to a problem? Please describe.
I write a test for each service to check it's creation and the correct registration of all required classes in the IServiceCollection.

My problem is the missing ServiceContext.

Describe the solution you'd like
If the class TestMocksRepository would be public and provided as a seperate NuGet-package I can use this to implement my tests.

Describe alternatives you've considered
I used ServiceFabric.Mocks but it's always behind the current version.

Additional context
Nothing to give.