Add Java bindings

[savacano28]

Context

• The project is currently Rust-only.
• Java and JVM languages are widely used in enterprise environments.
• This is a user-facing feature that enables integration into JVM ecosystems.

Use case

Developers want to use the library in Java/Kotlin backend systems.

Current Workaround

• Reimplementing logic in Java, or
• Calling Rust binaries externally

Proposed Solution

Provide Java bindings using:

• JNI with a C-compatible interface
• Optionally jni-rs

Additional Information

Care should be taken to provide a clean and idiomatic Java API.