Add Swift Binding

Add Swift language binding to improve project usability and adoption. This can be utilized in development for Apple platforms like iOS and macOS.

**Implementation (via Rust FFI):**

*   Use C-ABI interop.
*   UniFFI: <https://github.com/mozilla/uniffi-rs>
    *   **UniFFI Supported Languages:** Kotlin, Swift, Python, Ruby, C# (experimental), Go (experimental)
