Add MassTransit and NServiceBus interop for ASB topics and subscriptions

[jeremydmiller]

Summary

• Add UseMassTransitInterop() and UseNServiceBusInterop() to AzureServiceBusTopic (publishing) and AzureServiceBusSubscription (listening)
• Implement IMassTransitInteropEndpoint on both AzureServiceBusTopic and AzureServiceBusSubscription
• Add fluent configuration methods to AzureServiceBusTopicSubscriberConfiguration and AzureServiceBusSubscriptionListenerConfiguration

Previously, MassTransit/NServiceBus interop was only available on Azure Service Bus queues. This enables sending Wolverine messages to ASB topics that can be received by MassTransit or NServiceBus, and receiving messages from MassTransit or NServiceBus on ASB subscriptions.

Usage

// Publish to a topic with NServiceBus interop
opts.PublishAllMessages().ToAzureServiceBusTopic("nsb-topic")
    .UseNServiceBusInterop();

// Listen on a subscription with MassTransit interop
opts.ListenToAzureServiceBusSubscription("wolverine-sub")
    .FromTopic("wolverine-topic")
    .UseMassTransitInterop(mt => { })
    .DefaultIncomingMessage<ResponseMessage>().UseForReplies();

Test plan

• All 6 NServiceBus Azure interop tests pass (including 2 new topic/subscription tests)
• All 4 MassTransit Azure interop tests pass (including 2 new topic/subscription tests)
• Tests run against the Azure Service Bus emulator via docker-compose
• Verify no regressions in existing ASB test suite

🤖 Generated with Claude Code