Add support for exclusive mode

src/Spectre.Console/Extensions/AnsiConsoleExtensions.Exclusive.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="IAnsiConsole"/>.
+    /// </summary>
+    public static partial class AnsiConsoleExtensions
+    {
+        /// <summary>
+        /// Runs the specified function in exclusive mode.
+        /// </summary>
+        /// <typeparam name="T">The result type.</typeparam>
+        /// <param name="console">The console.</param>
+        /// <param name="func">The func to run in exclusive mode.</param>
+        /// <returns>The result of the function.</returns>
+        public static T RunExclusive<T>(this IAnsiConsole console, Func<T> func)
+        {
+            return console.ExclusivityMode.Run(func);
+        }
+
+        /// <summary>
+        /// Runs the specified function in exclusive mode asynchronously.
+        /// </summary>
+        /// <typeparam name="T">The result type.</typeparam>
+        /// <param name="console">The console.</param>
+        /// <param name="func">The func to run in exclusive mode.</param>
+        /// <returns>The result of the function.</returns>
+        public static Task<T> RunExclusive<T>(this IAnsiConsole console, Func<Task<T>> func)
+        {
+            return console.ExclusivityMode.Run(func);
+        }
+    }
+}