Summary of the new feature/enhancement

Currently PowerShell has a method that allows this, AddCommand(CommandInfo). However, there's no supported way to add a CommandInfo to a PSCommand instance directly. PowerShellEditorServices (and likely other projects) construct a PSCommand instance well before actually getting to the internal PowerShell object, so working with CommandInfo directly can only be done with reflection.

Proposed technical implementation details (optional)

using System.Management.Automation.Runspaces;

namespace System.Management.Automation
{
    public partial sealed class PSCommand
    {
        public PSCommand AddCommand(CommandInfo commandInfo)
        {
            return AddCommand(new Command(commandInfo));
        }
    }
}

namespace System.Management.Automation.Runspaces
{
    public sealed class Command
    {
-       internal Command(CommandInfo commandInfo) : this(commandInfo, false)
+       public Command(CommandInfo commandInfo) : this(commandInfo, false)
        {
        }
    }
}

/cc @TylerLeonhardt @rjmholt