Port Annotations Example to Java

[dudeuter]

Summary of changes

Makes some small changes to the Add Point Annotations Example, and then adds a version of it ported to Java.

example.mp4

User impact (optional)

Improves documentation for Java users, if only by a little. 🙂

Pull request checklist:

• Briefly describe the changes in this PR.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality. If tests were not written, please explain why.
• Optimize code for java consumption (@JvmOverloads, @file:JvmName, etc).
• Add example if relevant.
• Document any changes to public APIs.
• Run make update-api to update generated api files, if there's public API changes, otherwise the verify-api-* CI steps might fail.
• Update CHANGELOG.md or use the label 'skip changelog', otherwise check changelog CI step will fail.
• If this PR is a v10.[version] release branch fix / enhancement, merge it to main firstly and then port to v10.[version] release branch.

Fixes: < Link to related issues that will be fixed by this pull request, if they exist >

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