feat(tpu): add tpu vm create topology sample.

[TetyanaYahodska]

Description

Documentation - https://cloud.google.com/tpu/docs/managing-tpus-tpu-vm

Sample in Python - GoogleCloudPlatform/python-docs-samples#12719
Fixes #

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Checklist

• I have followed Sample Format Guide
• 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)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• tpu/src/main/java/tpu/CreateTpuWithTopologyFlag.java:19, tag tpu_vm_create_topology

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[minherz]

Please, review the ways to avoid creating TPU nodes. It is expensive and long operations.

Please, look into using zone(s) in the US.

Discuss options reuse the code sample CreateTpuWithTopologyFlag for "create TPU" as well. The sole difference between them looks like setting or not setting a topology.