Command to provide machine-readable information about task inputs

[ryanprior]

Hi there! I've been working on an Emacs integration for xc, and I'd like to be able to handle task inputs when they're required.

What do you think about a command that gives information about a task in machine-readable format, like Task.Display does for Markdown? I'd propose xc -output json -display TASK for machine-readable output. If you like this idea I'm happy to begin work on a PR.

[joerdav]

I think this would be valuable. I was thinking about how vscode and neovim don't really support inputs right now!