AsyncAPI: Include headers on event detail page

### Use Case

[Message](https://www.asyncapi.com/docs/reference/specification/v3.0.0#messageObject) in AsyncAPI besides payload have headers.
I want to see what metadata are available on event detail page.

Rendered AsyncAPI: https://freaz.github.io/eventcatalog-bug-reporting/docs/services/Example%20Service/1.0.0/asyncapi/asyncapi/#message-ExampleEvent
Event detail page: https://freaz.github.io/eventcatalog-bug-reporting/docs/events/exampleevent/1.0.0/
Project source: https://github.com/freaz/eventcatalog-bug-reporting

### Proposed Solution

Add Message Metadata section.

### Implementation Notes

_No response_

### Community Notes

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