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Hi,
I am trying to write a base class for a stack, which will be reused for a few projects which have separate, but similar infrastructures. Unfortunately, it looks like the outputs defined on the base class are not being registered in the derived stacks. From what I found, the reason is the `BindingFlags.DeclaredOnly` in this line of the `Stack.RegisterPropertyOutputs` method: <https://github.com/pulumi/pulumi-dotnet/blob/main/sdk/Pulumi/Stack.cs#L82>

Is there some reasoning behind this flag? Maybe the presence of the `Urn` output property in the Resource class which is a base class to a Stack. The ComponentResource has similar `RegisterOutputs` method, but instead of using `DeclaredOnly` flag, it explicitly ignores the `Urn` property:
<https://github.com/pulumi/pulumi-dotnet/blob/main/sdk/Pulumi/Resources/ComponentResource.cs#L70>

Do you think it would make sense to make it consistent and support implementing stack class hierarchies (including outputs from base classes) same as with ComponentResource?

I created a PR which implements this behavior and gives an example of such derived stack in tests:
<https://github.com/pulumi/pulumi-dotnet/pull/251>

I would be grateful for a feedback :slightly_smiling_face: