Encoding that sends raw format including resource and record attributes

[xzizka]

Component(s)

exporter/kafka

Is your feature request related to a problem? Please describe.

In this issue #35686 it was described a usecase that would require a complete record generated by OpenTelemetry Collector to be send in a RAW format. Unfortunatelly, the current raw format sends just body (https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/exporter/kafkaexporter/raw_marshaler.go#L31).

Describe the solution you'd like

Add an encoding, that would not limit the raw format to just body, but will also send resource and record attributes.

Describe alternatives you've considered

Save the whole 'message' to a variable and replace a Body with a content of this variable. It seems to me it will be resource consuming.

Additional context

Creating a follow-up issue recommended by @ChrsMark in #35686 (comment)

[github-actions]

Pinging code owners:

• exporter/kafka: @pavolloffay @MovieStoreGuy

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[braydonk]

Triage: Issue appears to contain necessary information. Moving to waiting-for-codeowners