Migrate System.CommandLine from 2.0.0-beta4 to 2.0.5

[Copilot]

• Analyze API changes needed for System.CommandLine 2.0.0-beta4 → 2.0.5 migration
• Remove System.CommandLine.Hosting and System.CommandLine.Rendering package references
• Update Program.cs to use new API, including a CancellationTokenSource triggered by Console.CancelKeyPress and AppDomain.CurrentDomain.ProcessExit; pass the token to host.StartAsync, InvokeAsync, and host.StopAsync; guard ProcessExit callback against ObjectDisposedException on normal exit
• Update BaseKiotaCommandHandler.cs: extend AsynchronousCommandLineAction, new signature; make ServiceProvider property required and non-nullable (IServiceProvider)
• Update KiotaHost.cs, KiotaClientCommands.cs, KiotaPluginCommands.cs, KiotaWorkspaceCommands.cs; make serviceProvider parameter required and non-nullable in all GetXXXCommand methods
• Update all 19 handler files; change ServiceProvider?.GetService<>() to ServiceProvider.GetService<>()
• Make ServiceProvider property required and non-nullable in KiotaRpcCommandHandler
• Add Spectre.Console package and replace hand-crafted DisplayTable() (pipes/dashes) with AnsiConsole.Write(table) using Spectre.Console Table
• Update KiotaHostTests.cs tests to use new API with ServiceCollection().BuildServiceProvider()
• Build succeeds with 0 errors, 0 warnings
• Run dotnet format and commit changes

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[baywet]

@copilot run dotnet format commit the changed files, do nothing else

[Copilot]

@copilot run dotnet format commit the changed files, do nothing else

Done in commit 21b92bb.

[Copilot]

@copilot run dotnet format commit the changed files, do nothing else

Done in commit e6dece3.

[Copilot]

@copilot run dotnet format commit the changed files, do nothing else

Done in commit 024fb4e.