Release RocketMQ Client Java 5.0.6

What's Changed

• Remove redundant code by @aaron-ai in #424
• Don't use GaugeObserver#close by @aaron-ai in #429
• Add ExcludeFromJacocoGeneratedReport annotation by @aaron-ai in #441
• Ensure the compatibility of modifications to the RocketMQ Java client code with OpenTelemetry instrumentation by @aaron-ai in #438
• fix: setGroup() invoked twice when wrapAckMessageRequest() by @f1amingo in #522
• Provides singleton example for producer by @aaron-ai in #540
• Bump rocketmq-proto from 2.0.2 to 2.0.3 by @aaron-ai in #550
• Implement the reentrant PushConsumer message receiving by @aaron-ai in #547
• Add comments to turn off SSL into the example code to avoid some compatibility issues by @aaron-ai in #552
• [ISSUE #608] Print message id and message queue when consume result is failure by @drpmma in #609
• update out-of-date java client examples by @kingkh1995 in #627
• [ISSUE #660] Add namespace in java client by @drpmma in #661
• [ISSUE #660] Add namespace in metadata by @drpmma in #671

Full Changelog: java-5.0.5...java-5.0.6