feat(managedkafka): code samples

[luongadam]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• [x] I have followed Sample Format Guide
• [x] pom.xml parent set to latest shared-configuration
• [ ] Appropriate changes to README are included in PR
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [x] Tests pass: mvn clean verify required
• [x] Lint passes: mvn -P lint checkstyle:check required
• [x] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [x] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [x] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [x] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 14 region tags.

- [managedkafka/examples/src/main/java/examples/CreateCluster.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/CreateCluster.java#L19), tag `managedkafka_create_cluster` - [managedkafka/examples/src/main/java/examples/CreateTopic.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/CreateTopic.java#L19), tag `managedkafka_create_topic` - [managedkafka/examples/src/main/java/examples/DeleteCluster.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/DeleteCluster.java#L19), tag `managedkafka_delete_cluster` - [managedkafka/examples/src/main/java/examples/DeleteConsumerGroup.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/DeleteConsumerGroup.java#L19), tag `managedkafka_delete_consumergroup` - [managedkafka/examples/src/main/java/examples/DeleteTopic.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/DeleteTopic.java#L19), tag `managedkafka_delete_topic` - [managedkafka/examples/src/main/java/examples/GetCluster.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/GetCluster.java#L19), tag `managedkafka_get_cluster` - [managedkafka/examples/src/main/java/examples/GetConsumerGroup.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/GetConsumerGroup.java#L19), tag `managedkafka_get_consumergroup` - [managedkafka/examples/src/main/java/examples/GetTopic.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/GetTopic.java#L19), tag `managedkafka_get_topic` - [managedkafka/examples/src/main/java/examples/ListClusters.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/ListClusters.java#L19), tag `managedkafka_list_clusters` - [managedkafka/examples/src/main/java/examples/ListConsumerGroups.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/ListConsumerGroups.java#L19), tag `managedkafka_list_consumergroups` - [managedkafka/examples/src/main/java/examples/ListTopics.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/ListTopics.java#L19), tag `managedkafka_list_topics` - [managedkafka/examples/src/main/java/examples/UpdateCluster.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/UpdateCluster.java#L19), tag `managedkafka_update_cluster` - [managedkafka/examples/src/main/java/examples/UpdateConsumerGroup.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/UpdateConsumerGroup.java#L19), tag `managedkafka_update_consumergroup` - [managedkafka/examples/src/main/java/examples/UpdateTopic.java:19](https://github.com/luongadam/java-docs-samples/blob/a1248cac037e2881baccd2c628550c1c2f30a429/managedkafka/examples/src/main/java/examples/UpdateTopic.java#L19), tag `managedkafka_update_topic`

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