TestContainers integration

[g7ed6e]

          As a further step it might be worth investigating integrating [TestContainers](https://dotnet.testcontainers.org/). Looking at their list of [modules](https://dotnet.testcontainers.org/modules/),they have nuget packages for [Kafka](https://www.nuget.org/packages/Testcontainers.Kafka) and [RabbitMq](https://www.nuget.org/packages/Testcontainers.RabbitMq). That's probably a project in it's own right, so I think we should merge this as it's an improvement over manually executing shell commands.

Originally posted by @mconnew in #1372 (comment)