[pulsar-io] Add a Pulsar IO connector for RabbitMQ sink

[murong00]

Motivation

Provides a builtin RabbitMQ Sink Connector, in order to persist pulsar messages to a RabbitMQ queue.

Modifications

Add a RabbitMQ Sink and some unit tests.

Verifying this change

This change can be verified as follows:

• deploy the RabbitMQ sink connector with configuration file containing the following fields:

configs:
    host: "localhost"
    port: "5672"
    virtualHost: "/"
    username: "quest"
    password: "quest"
    queueName: "test_queue"
    connectionName: "test_connection"
    exchangeName: "test_exchange"
    routingKey: "test_routing"

• deploy an RabbitMQ cluster and create the above elements
• send messages in the topic with specified schema declared when deploying the connector
• use rabbitmqadmin or rabbitmqctl to query messages in the specified queue

[merlimat]

👍