Sample App: BookReview Service: Implement the microservice v2

[Leo6Leo]

Problem

In this issue, we are implementing the knative service that provide all the supports that make the book review feature works. In this version, the event will go through the whole cycle: send to broker -> receive the event back from the broker -> save the comment in the database.

This will be a Node.js web server that is handling all the incoming requests, and route the event to the correct destination.

More details can be found in the design doc here.

Persona:

Which persona is this feature for?
Administrators and developers

Exit Criteria

• A docker image that contains the Node.js application, acting as the server to send the request to the database server and the inappropriate language ML service. And when the service receive the event back from the broker, it will save the data into the database.
• A detailed documentation that explains it and include the setup guide.

Time Estimate (optional):
How many developer-days do you think this may take to resolve?
2-3

Additional context (optional)