[.NET 11] Support

[jonpryor]

What would you like to be added? 💡

.NET 11 Preview 1 has been released: https://devblogs.microsoft.com/dotnet/dotnet-11-preview-1/

Obvious questions:

• Do uno apps build with .NET 11?
  Answer: Yes-ish: we cannot (yet) do dotnet new unoapp -tfm net11.0 (though see also Support .NET 11 uno.templates#1992), but you can replace all occurrences of net10.0 with net11.0 in the output of dotnet new unoapp -tfm net10.0 and build targeting .NET11. See also: unoplatform/performance@03e198c
  Question: …but does the output run?

• Can unoplatform/uno be built targeting e.g. net11.0/net11.0-android?
  This is being explored in: chore: Update to .NET 11 Preview 1 #22742

Why is this needed? 🤔

Maintain relevance with the .NET ecosystem.

Renderer 🎨

• Skia
• Native

For which platforms 📱💻🖥️

All platforms 🌍

Anything else we need to know? 💬

No response