fix: root simple payloads

[jonaslagoni]

Fixes #312

---

Note

• Fix module resolution in getMessageTypeAndModule: For non-object payloads, derive messageModule from messageModel.modelName instead of messageType to avoid invalid identifiers (e.g., Pet[]).
• Array/simple root payload support: Adds test coverage using a ConstrainedArrayModel (e.g., FindPetsByStatusAndCategoryResponse) and updates generated HTTP client types to FindPetsByStatusAndCategoryResponseModule.*.
• Protocol code updates: Regenerates snapshots for AMQP, Kafka, MQTT, NATS, WebSocket, and HTTP to use the new module imports (* as <ModelName>Module) and corresponding unmarshal/types.
• Minor test adjustments: Imports ConstrainedArrayModel and constructs array payload models in tests.

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[jonaslagoni]

🎉 This PR is included in version 0.63.1 🎉

The release is available on:

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