Add a Context for `pulsar.Message` interface

Receive method of Consumer returns Message directly, but if we want attach something(ex SpanContext) in Receive method to context, we can't bring it out without change type of Message interface.

So, it is possible to add a Context or find some other way to set a context for Message ?

```go
type Consumer interface {
Receive(context.Context) (Message, error)
...
}

```

Additional, when use SendAsync error handling, we can't get context directly without use Closure.

```go
producer.SendAsync(ctx, &pulsar.ProducerMessage{}, handleErrorFunc)
```

Thank you.

Start by reading the Consumer.Receive and Producer.SendAsync API definitions and the Message interface. Trace how contexts currently enter Receive and SendAsync, then determine the intended context-propagation behavior for received messages and asynchronous error handling. Done requires an agreed API design and corresponding tests for both paths.

Written by the indexing model from the issue text.