WebAssembly support

This is an experimental crate offering WASM bindings to the filter parser.

In order to build it, you currently need to install wasm-pack and execute the following command in current directory:

wasm-pack build -t no-modules

After that, wasm-pack will generate a Node.js package in pkg folder that should be ready for publishing or direct usage.

If you want to just check out a simple demo, you can open index.html either directly from the filesystem or by spinning a local HTTP server.