Add millis to consumed messages about xk6-kafka HOT 4 OPEN

A new consumer option for nanos precision was added. You can set nanoPrecision: true in the consumer configuration in order to have the time return in RFC3339Nano format.

Time field by default = "time": "2024-04-10T14:13:46+01:00"
With nanoPrecision: true = "time": "2024-04-10T13:08:49.127Z"

To have more flexibility this could be change further to allow specification of the exact format (as per @mostafa). We had questions around the format, whether it be javascript or go formats. Or constants for each format type.

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Hey @romankristof,

That is to make Goja (and the user) happy when exporting datetime to JSON, so you can use it in your JS code. I'd be happy to see contributions, though. As in, make this a configurable field on the consume function using the ConsumeConfig struct, which eventually gets passed down to the consume function.

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As long as there is no way to get the original (meaning with full precision) timestamp of the consumed message this is unusable to measure timings or generate metrics for the messages. Which is actually what one would like to do in load tests.
Please add a way to get the message timestamp with better precision.

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Hey @AndreasKorn,

I'd be happy if you contribute this feature.

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