Enable checkstyle on Pulsar

[sijie]

This is a master ticket for tracking the tasks to enable checkstyle on Pulsar modules.

• [ ] bouncy-castle
• [ ] buildtools
• [ ] managed-ledger
• [x] pulsar-broker
• [ ] pulsar-broker-auth-athenz
• [ ] pulsar-broker-auth-sasl
• [ ] pulsar-broker-common
• [ ] pulsar-broker-shaded
• [ ] pulsar-client
• [ ] pulsar-client-1x-base
• [ ] pulsar-client-admin
• [ ] pulsar-client-admin-shaded
• [ ] pulsar-client-all
• [x] pulsar-client-api
• [ ] pulsar-client-auth-athenz
• [ ] pulsar-client-auth-sasl
• [ ] pulsar-client-cpp
• [ ] pulsar-client-messagecrypto-bc
• [ ] pulsar-client-shaded
• [ ] pulsar-client-tools
• [ ] pulsar-client-tools-test
• [x] pulsar-common
• [ ] pulsar-config-validation
• [ ] pulsar-discovery-service
• [ ] pulsar-function-go
• [ ] pulsar-functions
• [ ] pulsar-io
• [ ] pulsar-metadata
• [x] pulsar-package-management
• [ ] pulsar-proxy
• [x] pulsar-sql
• [ ] pulsar-testclient
• [x] pulsar-transaction
• [ ] pulsar-websocket
• [ ] pulsar-zookeeper
• [ ] pulsar-zookeeper-utils
• [ ] testmocks
• [ ] tests
• [ ] tiered-storage

[Renkai]

I have just enabled checkstyle for module pulsar-broker, anyone interested in this issue is welcomed to take over it to enable other modules.

It's a good chance to:

• learn maven build workflow
• learn IDE settings
• practice regular expression replace
• practice keyboard shortcut dance

[sijie]

@Renkai Can you update the description of this issue to have a checklist of modules? Like what we did in https://github.com/streamnative/pulsar/issues/1762

[Renkai]

@Renkai Can you update the description of this issue to have a checklist of modules? Like what we did in #1762

Updated