Allow bulk producing of messages

[MikkelSchmidtDFDS]

This pull request introduces batch message production capabilities to the Producer class, allowing multiple messages to be produced in a single call with several overloads for different contexts and headers.

Batch message production enhancements:

• Added multiple overloads of the Produce method to the Producer class, enabling the production of multiple messages at once, with support for headers and message handler context. These methods ensure messages are produced in the order provided.

We should however consider to change the contract of the Producer to actually return the DeliveryResult from the KafkaProducer. (for both single and bulk producing)
And then update the the outbox the take advantage of this.

[DFDS-Snyk]

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