[improve][broker] PIP-192 Added --extensions option in BrokerMonitor

[heesung-sn]

Master Issue: #16691

Motivation

Raising a PR to implement #16691.

Modifications

This PR

• added --extensions option in BrokerMonitor in order to monitor BrokerLoadData in Load Balance Extension.

pulsar %  bin/pulsar-perf monitor-brokers --connect-string pulsar://localhost:6650 --extensions
2023-02-27T18:02:33,417-0800 [pulsar-client-io-1-3] INFO  org.apache.pulsar.client.impl.ConnectionPool - [[id: 0x330e1af9, L:/127.0.0.1:56972 - R:localhost/127.0.0.1:6650]] Connected to server
2023-02-27T18:02:33,551-0800 [pulsar-client-io-1-3] INFO  org.apache.pulsar.client.impl.ConsumerImpl - [non-persistent://pulsar/system/loadbalancer-broker-load-data][reader-617fc4e8f9] Subscribing to topic on cnx [id: 0x330e1af9, L:/127.0.0.1:56972 - R:localhost/127.0.0.1:6650], consumerId 0
2023-02-27T18:02:33,643-0800 [pulsar-client-io-1-3] INFO  org.apache.pulsar.client.impl.ConsumerImpl - [non-persistent://pulsar/system/loadbalancer-broker-load-data][reader-617fc4e8f9] Subscribed to topic on localhost/127.0.0.1:6650 -- consumer: 0
2023-02-27T18:11:33,718-0800 [main] INFO  org.apache.pulsar.testclient.BrokerMonitor -
Broker Data for localhost:8080:
===================================================================================================================
||SYSTEM         |CPU %          |MEMORY %       |DIRECT %       |BW IN %        |BW OUT %       |MAX %          ||
||               |17.24          |12.40          |26.95          |0.00           |0.00           |26.95          ||
||COUNT          |TOPIC          |BUNDLE         |PRODUCER       |CONSUMER       |BUNDLE +       |BUNDLE -       ||
||               |               |4              |               |               |               |               ||
||LATEST         |MSG/S IN       |MSG/S OUT      |TOTAL          |KB/S IN        |KB/S OUT       |TOTAL          ||
||               |100.02         |0.02           |100.03         |103.89         |0.01           |103.90         ||
===================================================================================================================

Verifying this change

• Make sure that the change passes the CI checks.

This change added tests and can be verified as follows:

• *Updated unit tests.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

We will have separate PRs to update the Doc later.

Matching PR in forked repository

PR in forked repository: heesung-sn#34