BE: Serde: Format non-string headers appropriately

[ravetdavid]

Issue submitter TODO list

• I've searched for an already existing issues here
• I'm running a supported version of the application which is listed here and the feature is not present there

Is your proposal related to a problem?

No response

Describe the feature you're interested in

Headers are always printed like String. For example, for an epoch in an header, the Long value is not discovered and not rendered as Long.

AKHQ does the job with the code (https://github.com/tchiotludo/akhq/blob/dev/src/main/java/org/akhq/utils/ContentUtils.java#L74-L98)

In case of a value not in uTF8, Long, Short then the bytes are printed in hexa.

Describe alternatives you've considered

No response

Version you're running

1.1.0

Additional context

No response

[github-actions]

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