Add ConsoleExtensions: WithForegroundColor, WithBackgroundColor, WithColors

[Copilot]

Ports the WithForegroundColor pattern from DotnetRuntimeBootstrapper and extends it with background and compound variants. Each method temporarily changes the console color(s) and returns an IDisposable that restores the previous value(s) on dispose.

• WithForegroundColor(ConsoleColor) — scoped foreground color change
• WithBackgroundColor(ConsoleColor) — scoped background color change
• WithColors(ConsoleColor, ConsoleColor) — compound; merges both disposables so a single using restores both colors

using (Console.WithColors(ConsoleColor.White, ConsoleColor.Red))
{
    Console.WriteLine("Error: something went wrong");
}
// foreground and background both restored here

[Copilot]

Pull request overview

Adds scoped console color helpers to PowerKit’s extensions set, enabling temporary foreground/background color changes via IDisposable handles that restore prior console state on disposal.

Changes:

• Introduces Console.WithForegroundColor(ConsoleColor) for scoped foreground color changes.
• Introduces Console.WithBackgroundColor(ConsoleColor) for scoped background color changes.
• Introduces Console.WithColors(ConsoleColor, ConsoleColor) to apply both colors under a single scope.

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