feat: Added support for Spring Messaging @Header annotations

[ctasada]

Fixes issue #563

Now, when a method is annotated with the @Header or @Headers annotation, the payload marked with @Payload will also include the defined headers.

Known limitations:

• If a @Payload is indicated in different places, the AsyncAPI specification will include any correlated @Header
• When using @Headers we cannot provide further information

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[sam0r040]

Superseded by https://github.com/springwolf/springwolf-core/pull/787