Enable lazy loading .NET "frameworks"

[richlander]

It should be possible to write code that lights up when a given higher-level framework, like ASP.NET Core or Windows Desktop is available.

I ran into this with PowerShell. Some variants depend on Microsoft.WindowsDesktop.App and others Microsoft.NetCore.App. Ideally, all variants would depend on the latter and light up on the former (when running on Windows).

Current behavior when you rewrite the pwsh.runtimeconfig.json to Microsoft.NetCore.App: https://github.com/PowerShell/PowerShell/issues/12550

Current pwsh.runtimeconfig.json when distributed as a .NET tool:

PS C:\Users\rich> type .\.dotnet\tools\.store\powershell\7.0.0\powershell\7.0.0\tools\netcoreapp3.1\any\win\pwsh.runtimeconfig.json
{
  "runtimeOptions": {
    "tfm": "netcoreapp3.1",
    "framework": {
      "name": "Microsoft.WindowsDesktop.App",
      "version": "3.1.0"
    },
    "rollForwardOnNoCandidateFx": 2,
    "configProperties": {
      "System.Runtime.TieredCompilation": true,
      "System.Runtime.TieredCompilation.QuickJit": true,
      "System.Runtime.TieredCompilation.QuickJitForLoops": true
    }
  }
}

[ghost]

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