Support for PrivateAssets property containing keyword compile

[sorensenmatias]

Fixes a bug where snitch reports PackageReferences that can be removed, even though the referenced project has specified the PackageReference with PrivateAssets containg the keyword "compile". This means that removing the PackageReference will actually break the build. See here for more information: https://docs.microsoft.com/en-us/nuget/consume-packages/package-references-in-project-files#controlling-dependency-assets

[CLAassistant]

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[patriksvensson]

@sorensenmatias You will need to sign the CLA agreement as well.

[sorensenmatias]

@sorensenmatias You will need to sign the CLA agreement as well.

@patriksvensson Oops - it's done. Thanks.

[patriksvensson]

Merged! Thank you for your contribution. Much appreciated! 👍