feat: Returning result with a message for non-zero codes

Author: kamil-mrzyglod

ace/ApplicationResult.cs

@@ -0,0 +1,7 @@
+namespace ACE;
+
+internal sealed class ApplicationResult(int exitCode, string? errorMessage)
+{
+    public int ExitCode { get; } = exitCode;
+    public string? ErrorMessage { get; } = errorMessage;
+}