docs(samples): add a simple sample for feature online store with Bigtable

[axyojp]

Description

Adding Java sample code for Vertex AI Feature Store

Checklist

• [x] I have followed Sample Format Guide
• [x] pom.xml parent set to latest shared-configuration
• [x] Appropriate changes to README are included in PR
• [x] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [x] 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

About GCP Project

The GCP project you provide should be enabled Vertex AI APIs.

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 4 region tags.

- [aiplatform/src/main/java/aiplatform/CreateFeatureOnlineStoreFixedNodesSample.java:24](https://github.com/axyojp/java-docs-samples/blob/6deac00a9c5e455f77438614a709f370c92ceeb0/aiplatform/src/main/java/aiplatform/CreateFeatureOnlineStoreFixedNodesSample.java#L24), tag `aiplatform_create_featureOnlineStore_bigtable_sample` - [aiplatform/src/main/java/aiplatform/CreateFeatureOnlineStoreFixedNodesSample.java:61](https://github.com/axyojp/java-docs-samples/blob/6deac00a9c5e455f77438614a709f370c92ceeb0/aiplatform/src/main/java/aiplatform/CreateFeatureOnlineStoreFixedNodesSample.java#L61), tag `aiplatform_create_featureOnlineStore_bigtable_sample_create` - [aiplatform/src/main/java/aiplatform/DeleteFeatureOnlineStoreSample.java:24](https://github.com/axyojp/java-docs-samples/blob/6deac00a9c5e455f77438614a709f370c92ceeb0/aiplatform/src/main/java/aiplatform/DeleteFeatureOnlineStoreSample.java#L24), tag `aiplatform_delete_feature_online_store_sample` - [aiplatform/src/main/java/aiplatform/DeleteFeatureOnlineStoreSample.java:52](https://github.com/axyojp/java-docs-samples/blob/6deac00a9c5e455f77438614a709f370c92ceeb0/aiplatform/src/main/java/aiplatform/DeleteFeatureOnlineStoreSample.java#L52), tag `aiplatform_delete_feature_online_store_sample_delete`

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[axyojp]

The GCP project you provide should be enabled Vertex AI APIs.

[minherz]

The GCP project you provide should be enabled Vertex AI APIs.

I am unsure which GCP project you are referencing. Is it the one set in UCAIP_PROJECT_ID? I do not see where it is set up. I can confirm that Vertex AI API and Vertex AI API (autopush) are enabled in the basic e2e testing project. Also, please, confirm the list of API names that should be enabled.

[axyojp]

The GCP project you provide should be enabled Vertex AI APIs.

I am unsure which GCP project you are referencing. Is it the one set in UCAIP_PROJECT_ID? I do not see where it is set up. I can confirm that Vertex AI API and Vertex AI API (autopush) are enabled in the basic e2e testing project. Also, please, confirm the list of API names that should be enabled.

Yes, I mentioned about UCAIP_PROJECT_ID. I intended to reply to the comment below: https://github.com/GoogleCloudPlatform/java-docs-samples/pull/9341#discussion_r1617807818

I think you need nothing to do in basic e2e testing project because you confirm Vertex AI API and Vertex AI API (autopush) are enabled. This sample code doesn't use new additional APIs.