refactor(compute): create Spot samples

[ssvir]

Description

implemented samples : compute_spot_check, compute_spot_create 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[bot]]

Here is the summary of changes.

You are about to add 2 region tags.

- [compute/cloud-client/src/main/java/compute/spots/CheckIsSpotVm.java:19](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/dc403f6150863d70e25f1e8bdb6e566776546e1d/compute/cloud-client/src/main/java/compute/spots/CheckIsSpotVm.java#L19), tag `compute_spot_check` - [compute/cloud-client/src/main/java/compute/spots/CreateSpotVm.java:19](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/dc403f6150863d70e25f1e8bdb6e566776546e1d/compute/cloud-client/src/main/java/compute/spots/CreateSpotVm.java#L19), tag `compute_spot_create`

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