RabbitMQ v10 upgrade guide (#6850)

* RabbitMQ v10 upgrade guide

* Update rabbitmq-9to10.md

* Update rabbitmq-9to10.md

---------

Co-authored-by: danielmarbach <danielmarbach@users.noreply.github.com>
Co-authored-by: Brandon Ording <bording@gmail.com>

transports/upgrades/rabbitmq-9to10.md

@@ -0,0 +1,26 @@
+---
+title: RabbitMQ Transport Upgrade Version 9 to 10
+summary: Instructions on how to upgrade RabbitMQ Transport from version 9 to 10.
+reviewed: 2024-09-25
+component: Rabbit
+related:
+- transports/rabbitmq
+isUpgradeGuide: true
+upgradeGuideCoreVersions:
+ - 9
+---
+
+## RabbitMQ Client v7 Upgrade
+
+The transport now uses [RabbitMQ.Client v7.0.0](https://www.nuget.org/packages/RabbitMQ.Client/7.0.0), which exclusively supports an async API model. This change results in some breaking changes in the public API.
+
+For details, see the [RabbitMQ client changelog](https://github.com/rabbitmq/rabbitmq-dotnet-client/releases/tag/v7.0.0).
+
+### `IRoutingTopology` Updates
+
+The following changes have been made to `IRoutingTopology`:
+
+- All methods return a [ValueTask](https://devblogs.microsoft.com/dotnet/understanding-the-whys-whats-and-whens-of-valuetask/).
+- The type of the `channel` parameter has been changed from `RabbitMQ.Client.IModel` to `RabbitMQ.Client.IChannel`.
+- The type of the `properties` parameter has been changed from `RabbitMQ.Client.IBasicProperties` to `RabbitMQ.Client.BasicProperties`.
+- All methods include a [CancellationToken](https://learn.microsoft.com/en-us/dotnet/standard/threading/cancellation-in-managed-threads) as the last parameter.