Adds routing key support for rabbitmq

[PascalSenn]

No description provided.

[Copilot]

Pull request overview

Adds RabbitMQ topic-exchange routing key support by allowing message types to define a routing key extractor, propagating it via dispatch middleware into the envelope headers, and having the RabbitMQ dispatch endpoint publish with that routing key.

Changes:

• Introduces a per-MessageType feature collection and wires it up from configuration to runtime.
• Adds RabbitMQ routing key configuration (UseRabbitMQRoutingKey) + dispatch middleware to set the routing key header.
• Updates RabbitMQ dispatch to read the routing key header and includes unit + integration tests for routing behavior.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/Mocha/test/Mocha.Transport.RabbitMQ.Tests/RabbitMQRoutingKeyTests.cs	Unit tests validating extractor storage on MessageType.Features and middleware header behavior.
src/Mocha/test/Mocha.Transport.RabbitMQ.Tests/Behaviors/RoutingKeyTests.cs	Integration tests verifying topic binding routing and routing-key header propagation.
src/Mocha/src/Mocha/MessageTypes/MessageType.cs	Adds Features to MessageType and initializes from configuration features.
src/Mocha/src/Mocha.Transport.RabbitMQ/Topology/Extensions/RabbitMQTransportDescriptorExtensions.cs	Registers routing-key dispatch middleware before serialization in RabbitMQ defaults.
src/Mocha/src/Mocha.Transport.RabbitMQ/RabbitMQRoutingKeyExtractor.cs	Defines internal feature object for extracting routing keys from messages.
src/Mocha/src/Mocha.Transport.RabbitMQ/RabbitMQRoutingKeyExtensions.cs	Adds public descriptor extension to configure routing key extraction per message type.
src/Mocha/src/Mocha.Transport.RabbitMQ/RabbitMQMessageHeaders.cs	Adds RoutingKey typed header key constant.
src/Mocha/src/Mocha.Transport.RabbitMQ/RabbitMQDispatchEndpoint.cs	Uses the routing key header when publishing to an exchange.
src/Mocha/src/Mocha.Transport.RabbitMQ/Middlewares/Dispatch/RabbitMQRoutingKeyMiddleware.cs	Dispatch middleware that writes routing key into dispatch headers when configured.
src/Mocha/src/Mocha.Transport.RabbitMQ/Middlewares/Dispatch/RabbitMQDispatchMiddlewares.cs	Exposes a preconfigured dispatch middleware entry for routing key extraction.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (6a3b7a3) to head (24bf420).
⚠️ Report is 1056 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #9481       +/-   ##
==========================================
- Coverage   74.16%       0   -74.17%     
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  Files        2677       0     -2677     
  Lines      140790       0   -140790     
  Branches    16371       0    -16371     
==========================================
- Hits       104421       0   -104421     
+ Misses      30774       0    -30774     
+ Partials     5595       0     -5595     

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