Pass the context to the telemetry hooks

[StarpTech]

Hi, it would be very useful if we would have access to the producer context in the telemetry hooks. This would allow us to trace application specific and connect metrics points specific to the trace in the context. This would work with OpenTelemetry.

My proposal is to pass the ctx as the first parameter to the functions.

[twmb]

Which context? The client context closes only when the client is closed. I'm not opposed, although this doubles the surface area of hooks for a pretty marginal gain. Would you be open to contributing this?

[StarpTech]

I was referring to the context passed to Produce