Add extensibility sample (Azure#22770)

* Add extensibility sample

* Export API

* Rename file

* Update sdk/servicebus/Azure.Messaging.ServiceBus/samples/Sample09_Extensibility.md

Co-authored-by: Jesse Squire <jesse.squire@gmail.com>

* Update sdk/servicebus/Azure.Messaging.ServiceBus/samples/Sample09_Extensibility.md

Co-authored-by: Jesse Squire <jesse.squire@gmail.com>

Co-authored-by: Jesse Squire <jesse.squire@gmail.com>

Author: JoshLove-msft

sdk/servicebus/Azure.Messaging.ServiceBus/Azure.Messaging.ServiceBus.sln

@@ -28,6 +28,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "samples", "samples", "{8B8C
 		samples\Sample06_Transactions.md = samples\Sample06_Transactions.md
 		samples\Sample07_CrudOperations.md = samples\Sample07_CrudOperations.md
 		samples\Sample08_Interop.md = samples\Sample08_Interop.md
+		samples\Sample09_Extensibility.md = samples\Sample09_Extensibility.md
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Azure.Core", "..\..\core\Azure.Core\src\Azure.Core.csproj", "{9CD1905A-19B9-4F71-8BE6-D25CF49DA5B3}"

sdk/servicebus/Azure.Messaging.ServiceBus/MigrationGuide.md

@@ -296,7 +296,7 @@ Task ErrorHandler(ProcessErrorEventArgs args)
 // start processing
 await processor.StartProcessingAsync();
 
-// since the processing happens in the background, we add a Conole.ReadKey to allow the processing to continue until a key is pressed.
+// since the processing happens in the background, we add a Console.ReadKey to allow the processing to continue until a key is pressed.
 Console.ReadKey();
 ```
 

sdk/servicebus/Azure.Messaging.ServiceBus/README.md

@@ -373,7 +373,7 @@ Task ErrorHandler(ProcessErrorEventArgs args)
 // start processing
 await processor.StartProcessingAsync();
 
-// since the processing happens in the background, we add a Conole.ReadKey to allow the processing to continue until a key is pressed.
+// since the processing happens in the background, we add a Console.ReadKey to allow the processing to continue until a key is pressed.
 Console.ReadKey();
 ```
 

sdk/servicebus/Azure.Messaging.ServiceBus/api/Azure.Messaging.ServiceBus.netstandard2.0.cs

@@ -197,6 +197,8 @@ public static partial class ServiceBusModelFactory
     public partial class ServiceBusProcessor : System.IAsyncDisposable
     {
         protected ServiceBusProcessor() { }
+        protected ServiceBusProcessor(Azure.Messaging.ServiceBus.ServiceBusClient client, string queueName, Azure.Messaging.ServiceBus.ServiceBusProcessorOptions options) { }
+        protected ServiceBusProcessor(Azure.Messaging.ServiceBus.ServiceBusClient client, string topicName, string subscriptionName, Azure.Messaging.ServiceBus.ServiceBusProcessorOptions options) { }
         public virtual bool AutoCompleteMessages { get { throw null; } }
         public virtual string EntityPath { get { throw null; } }
         public virtual string FullyQualifiedNamespace { get { throw null; } }
@@ -275,6 +277,8 @@ public enum ServiceBusReceiveMode
     public partial class ServiceBusReceiver : System.IAsyncDisposable
     {
         protected ServiceBusReceiver() { }
+        protected ServiceBusReceiver(Azure.Messaging.ServiceBus.ServiceBusClient client, string queueName, Azure.Messaging.ServiceBus.ServiceBusReceiverOptions options) { }
+        protected ServiceBusReceiver(Azure.Messaging.ServiceBus.ServiceBusClient client, string topicName, string subscriptionName, Azure.Messaging.ServiceBus.ServiceBusReceiverOptions options) { }
         public virtual string EntityPath { get { throw null; } }
         public virtual string FullyQualifiedNamespace { get { throw null; } }
         public virtual bool IsClosed { get { throw null; } }
@@ -345,6 +349,7 @@ protected ServiceBusRetryPolicy() { }
     public partial class ServiceBusSender : System.IAsyncDisposable
     {
         protected ServiceBusSender() { }
+        protected ServiceBusSender(Azure.Messaging.ServiceBus.ServiceBusClient client, string queueOrTopicName) { }
         public virtual string EntityPath { get { throw null; } }
         public virtual string FullyQualifiedNamespace { get { throw null; } }
         public virtual bool IsClosed { get { throw null; } }
@@ -369,6 +374,8 @@ protected ServiceBusSender() { }
     public partial class ServiceBusSessionProcessor : System.IAsyncDisposable
     {
         protected ServiceBusSessionProcessor() { }
+        protected ServiceBusSessionProcessor(Azure.Messaging.ServiceBus.ServiceBusClient client, string queueName, Azure.Messaging.ServiceBus.ServiceBusSessionProcessorOptions options) { }
+        protected ServiceBusSessionProcessor(Azure.Messaging.ServiceBus.ServiceBusClient client, string topicName, string subscriptionName, Azure.Messaging.ServiceBus.ServiceBusSessionProcessorOptions options) { }
         public virtual bool AutoCompleteMessages { get { throw null; } }
         public virtual string EntityPath { get { throw null; } }
         public virtual string FullyQualifiedNamespace { get { throw null; } }

sdk/servicebus/Azure.Messaging.ServiceBus/samples/Sample04_Processor.md

@@ -66,7 +66,7 @@ Task ErrorHandler(ProcessErrorEventArgs args)
 // start processing
 await processor.StartProcessingAsync();
 
-// since the processing happens in the background, we add a Conole.ReadKey to allow the processing to continue until a key is pressed.
+// since the processing happens in the background, we add a Console.ReadKey to allow the processing to continue until a key is pressed.
 Console.ReadKey();
 ```