feat(rust): add Rust language support for code generation, including handler registration and runtime execution; update dependencies and configuration for Rust integration

[sophatvathana]

Summary

• feat(rust): add Rust language support for code generation, including handler registration and runtime execution; update dependencies and configuration for Rust integration

Changes

• Rust code generation
• Rust compiler integration for dev server
• Rust runtime execution
• Complete Rust example project with handlers and schemas
• Updates to CLI, engine, and runtime to support Rust

Testing

• cargo test
• cargo fmt --check
• Other (describe):

Checklist

• I updated relevant docs (README, CONTRIBUTING, etc.).
• I added tests or explained why they’re unnecessary.
• I verified CI passes locally or explained why it wasn’t run.

Screenshots / Notes (optional)

• Add screenshots, logs, or anything reviewers should see.