[feat] Add consumer interceptor

[RobertIndie]

Master Issue: #150

Motivation

This is the consumer interceptor implementation of #150.

There are some trigger events that are not implemented due to the current PR is big enough:

• onNegativeAcksSend
• onAckTimeoutSend
• onPartitionsChange

I will add them in another PR.

Modifications

• Add ProducerInterceptor interface
• Add intercept and getInterceptors in ProducerConfiguration.
• Triggering the interceptor when beforeConsume, onAcknowledge, onAcknowledgeCumulative and close.

Verifying this change

This change added tests.

Documentation

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[BewareMyPower]

I don't think we need to implement the close method, as well as the close method of producer interceptor. I checked the code in Java client, the close method is actually never used. (Please correct me if I was wrong)

[RobertIndie]

I don't think we need to implement the close method, as well as the close method of producer interceptor. I checked the code in Java client, the close method is actually never used. (Please correct me if I was wrong)

As we discussed here: #169 (comment), we think it's a missing implementation for the java client. It doesn't make sense to expose the close method but it doesn't do anything