Get rid of JS wrapper for Wasm

[lastmjs]

Once Wasm is officially integrated with ES Modules, I believe we should be able to get rid of our JavaScript wrapper...at least for pure Wasm and Wat files...AssemblyScript and Rust, we might want to keep the wrapper for the wasm-bindgen and AssemblyScript loader stuff. But, either way, we want to get rid of the exported promise so that you can use the modules without awaiting them