Allow isolate CircuitBreakerManualControl using constructor

src/Polly.Core/CircuitBreaker/CircuitBreakerManualControl.cs

@@ -15,6 +15,19 @@ public sealed class CircuitBreakerManualControl : IDisposable
     private readonly HashSet<Func<ResilienceContext, Task>> _onReset = new();
     private bool _isolated;
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CircuitBreakerManualControl"/> class.
+    /// </summary>
+    public CircuitBreakerManualControl()
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CircuitBreakerManualControl"/> class.
+    /// </summary>
+    /// <param name="isIsolated">Determines whether the circit breaker is isolated immediately after construction.</param>
+    public CircuitBreakerManualControl(bool isIsolated) => _isolated = isIsolated;
+
     internal void Initialize(Func<ResilienceContext, Task> onIsolate, Func<ResilienceContext, Task> onReset, Action onDispose)
     {
         _onDispose.Add(onDispose);

src/Polly.Core/PublicAPI.Unshipped.txt

@@ -32,6 +32,7 @@ Polly.CircuitBreaker.BrokenCircuitException<TResult>.BrokenCircuitException(TRes
 Polly.CircuitBreaker.BrokenCircuitException<TResult>.Result.get -> TResult
 Polly.CircuitBreaker.CircuitBreakerManualControl
 Polly.CircuitBreaker.CircuitBreakerManualControl.CircuitBreakerManualControl() -> void
+Polly.CircuitBreaker.CircuitBreakerManualControl.CircuitBreakerManualControl(bool isIsolated) -> void
 Polly.CircuitBreaker.CircuitBreakerManualControl.CloseAsync(System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.Task!
 Polly.CircuitBreaker.CircuitBreakerManualControl.Dispose() -> void
 Polly.CircuitBreaker.CircuitBreakerManualControl.IsolateAsync(System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.Task!

test/Polly.Core.Tests/CircuitBreaker/CircuitBreakerManualControlTests.cs

@@ -4,6 +4,27 @@ namespace Polly.Core.Tests.CircuitBreaker;
 
 public class CircuitBreakerManualControlTests
 {
+    [InlineData(true)]
+    [InlineData(false)]
+    [Theory]
+    public void Ctor_Isolated(bool isolated)
+    {
+        using var control = new CircuitBreakerManualControl(isolated);
+        var isolateCalled = false;
+
+        control.Initialize(
+            c =>
+            {
+                c.IsSynchronous.Should().BeTrue();
+                isolateCalled = true;
+                return Task.CompletedTask;
+            },
+            _ => Task.CompletedTask,
+            () => { });
+
+        isolateCalled.Should().Be(isolated);
+    }
+
     [InlineData(true)]
     [InlineData(false)]
     [Theory]