Add example for RabbitMQ stream plugin

It shows how to use the plugin with the AMQP client.

examples/stream_plugin/README.md

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+RabbitMQ Stream Examples 
+---
+The [stream plugin](https://www.rabbitmq.com/streams.html) is available starting from RabbitMQ 3.9
+
+These examples show how to use this lib to create/send/receive messages from stream queues.
+
+Send a message to a stream queue
+```
+./send_stream.js   
+```
+
+Reveice all the messages from stream queue:
+```
+./receive_stream.js 
+```

examples/stream_plugin/receive_stream.js

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+#!/usr/bin/env node
+
+var amqp = require('amqplib');
+
+amqp.connect('amqp://localhost').then(function (conn) {
+    process.once('SIGINT', function () { conn.close(); });
+    return conn.createChannel().then(function (ch) {
+
+        var q = 'my_first_stream';
+        // Define the queue stream
+        // Mandatory: exclusive: false, durable: true  autoDelete: false
+        var ok = ch.assertQueue(q, {
+            exclusive: false,
+            durable: true,
+            autoDelete: false,
+            arguments: {
+                'x-queue-type': 'stream', // Mandatory to define stream queue
+                'x-max-length-bytes': 2_000_000_000 // Set the queue retention to 2GB else the stream doesn't have any limit
+            }
+        })
+
+        ch.qos(100); // this is mandatory
+
+        ok = ok.then(function (_qok) {
+            return ch.consume(q, function (msg) {
+                console.log(" [x] Received '%s'", msg.content.toString());
+                ch.ack(msg); // mandatory
+            }, {
+                noAck: false,
+                arguments: {
+                    'x-stream-offset': 'first' // here you can specify the offset: : first, last, next, and timestamp
+                    // with first start consuming always from the beginning 
+
+                }
+            },
+            );
+        });
+
+        return ok.then(function (_consumeOk) {
+            console.log(' [*] Waiting for messages. To exit press CTRL+C');
+        });
+    });
+}).catch(console.warn);

examples/stream_plugin/send_stream.js

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+#!/usr/bin/env node
+
+var amqp = require('amqplib');
+
+amqp.connect('amqp://localhost').then(function (conn) {
+    return conn.createChannel().then(function (ch) {
+        var q = 'my_first_stream';
+
+        // Define the queue stream
+        // Mandatory: exclusive: false, durable: true  autoDelete: false
+        var ok = ch.assertQueue(q, {
+            exclusive: false,
+            durable: true,
+            autoDelete: false,
+            arguments: {
+                'x-queue-type': 'stream', // Mandatory to define stream queue
+                'x-max-length-bytes': 2_000_000_000 // Set the queue retention to 2GB else the stream doesn't have any limit
+            }
+        })
+
+        var msg = 'Hello World!';
+
+        // send the message to the stream queue
+        return ok.then(function (_qok) {
+            ch.sendToQueue(q, Buffer.from(msg));
+            console.log(" [x] Sent '%s'", msg);
+            return ch.close();
+        });
+    }).finally(function () { conn.close(); });
+}).catch(console.warn);