feat: refactor code

[andysim3d]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

---

PR-Codex overview

This PR focuses on restructuring the signer-sdk by removing outdated files, introducing new classes for user and request handling, and improving the overall API design. It also updates the build configuration to support Gradle.

Detailed summary

• Deleted obsolete files: pom.xml, GetUser.java, AuthUser.java, SignRawMessage.java.
• Added SignerSeriveException class for exception handling.
• Introduced UserStamper record for user and stamper pairing.
• Created StampedRequest and HttpConfig records with detailed constructors.
• Added AuthJWT and SignMessage classes with request/response records.
• Updated SignerClient to use UserStamper and refactored authentication methods.
• Modified .gitignore to exclude build directories.
• Updated build configuration to Gradle with Java compatibility settings.

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 20, 2025 6:05pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 20, 2025 6:05pm

[adamegyed]

Looks good