OpenCLI support

[aetos382]

The --cli-schema option has been added in .NET 10.0 SDK Preview 6 (link).

This appears to serve the same purpose as the OpenCLI Specification proposed by the author of Spectre.Console.

The .NET SDK is built on top of System.CommandLine.
Subprojects such as System.CommandLine.Rendering were deprecated in beta5, and the System.CommandLine team recommends using Spectre.Console.
Providing a CLI schema will also be relevant for dotnet-suggest.

While there may not be enough time to significantly change the specification of the --cli-schema option in the .NET SDK 10.0 at this point, do you plan to collaborate closely to unify the specifications for this initiative?

[baronfel]

Yes, the dotnet CLI intends to align with OpenCLI. The --cli-schema flag is hidden currently as a way to mark it as a preview feature, and we'll not be making it stable until we do this alignment.