Add C# 12

[Captain-Quack]

Please complete the following information:

• Name: C#
• Version: 12
• Release Note/Changelog:
  • C# 12: https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-12
  • C# 11: https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-11

C# 12 was introduced with .NET 8 which is LTS version (like .NET 6 and C# 10)

It would be good to have in .csproj these entries:

	<PropertyGroup>
		<ImplicitUsings>enable</ImplicitUsings>
		<Nullable>enable</Nullable>
	</PropertyGroup>

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:+1: reaction might help to get this request prioritized.