Is your feature request related to a problem? Please describe.
I want to add opentracing tracking for message delivery. Executing opentracing related code in the interceptor is an elegant way which won't cause a bad influence on my logic code. However, the interceptor has no context parameter, which makes it difficult to pass in the relevant context.

Describe the solution you'd like
I want to add context param in ProducerInterceptor's BeforeSend method.
BeforeSend(producer Producer, message *ProducerMessage)
↓
BeforeSend(ctx context.Context, producer Producer, message *ProducerMessage)