[FEATURE] Make x-parser-original-payload exist in default parser

[HansMartinJ]

Why do we need this improvement?

It exists in the avro parser, but not in the default one. The parser adds a lot of metadata and it would be useful to have access the "pure" spec.

This is related to #683, but it's closed

How will this change help?

To save asyncapi files that aren't full of metadata fields

Screenshots

No response

How could it be implemented/designed?

🚧 Breaking changes

No

👀 Have you checked for similar open issues?

• I checked and didn't find a similar issue

🏢 Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to work on this issue?

No, someone else can work on it.

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