Make WebAssembly version using Rust version of Doublets

This will allow users to execute link-cli directly in browser.

https://www.npmjs.com/package/doublets-web

To make it work, we also need to make sure all tests pass here: https://github.com/linksplatform/Protocols.Lino/blob/03be561ef9612fe7a86ed9f2ad964827cc6b4df5/rust/src/lib.rs