fix: primitives and expected headers

[jonaslagoni]

Note

Introduces full support for non-object payloads and tightens header handling across protocols.

• Adds createPrimitivesPreset and wires it into the TS payload generator to emit marshal/unmarshal (+optional validation) for primitive and array types
• Refactors AMQP/Kafka/MQTT publish code to build headers/options only when channel headers exist; improves Kafka header typing/injection and MQTT userProperties typing
• Fixes WebSocket subscribe validation to marshal using the message module instead of instance .marshal()
• Expands test/runtime artifacts with new string/array/union payload models, channels, and specs (including OpenAPI array response), and updates topic maps/snapshots

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[jonaslagoni]

🎉 This PR is included in version 0.62.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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