chore(ai): Add /create-java-pr Claude Code skill

[adinauer]

📜 Description

Add a create-java-pr Claude Code skill that automates the PR creation workflow for sentry-java: branch creation, code formatting, API dump, committing, pushing, PR creation, and changelog updates.

💡 Motivation and Context

Standardizes the PR workflow so Claude Code follows the same steps every time, reducing manual effort and ensuring nothing is missed (formatting, API dump, changelog, etc.).

#skip-changelog

💚 How did you test it?

Invoked /create-java-pr in Claude Code and confirmed it follows all steps.

📝 Checklist

• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

🤖 Generated with Claude Code

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Cursor Bugbot has reviewed your changes and found 3 potential issues.

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