Microsoft.Toolkit.Uwp.Notifications support in .NET 5

[RandomEngy]

Describe the problem this feature would solve

Currently when you install Microsoft.Toolkit.Uwp.Notifications on a .NET 5 app, it will give a build error:

Referencing a Windows Metadata component directly when targeting .NETCoreApp,Version=v5.0 is not supported. Use the C#/WinRT projection tool (https://aka.ms/cswinrt) or a provided projection for this target.

I also tried adding a TFM via <TargetFramework>net5.0-windows10.0.17763.0</TargetFramework> as recommended by the docs, but that resulted in different errors about duplicate type declarations. Also it required a rather hefty 25MB Microsoft.Windows.SDK.NET.dll.

Describe the solution

It would be nice for Microsoft.Toolkit.Uwp.Notifications to support .NET 5, possibly by including the right projection to support the Windows Notification APIs.

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[RandomEngy]

Nevermind, found #3622