Windowscommunitytoolkit: [Tests] Investigate how we can use Moq (or similar) in Unit Tests to fake WinRT APIs

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After a few hours searching I'm not sure there's a supported mocking framework that will enable this.

TypeMock.Isolator _may_ be a possibility but I'm not sure of the practicalities of adding a dependency on something with a paid license.

I'd instead look at creating a stub or adapter around the native calls that can then be adjusted as necessary for testing.

Thanks for taking a look @mrlacey. 🦙❤ Some libraries have open source licenses, it was hard to tell if they do or not.

I think with our new Unit Tests and soon to be Integration tests running in the CI that should cover the majority of the toolkit.

I'll see if any of our inbox app teams are doing anything in this space as well and have any suggestions.