WASM integration information

Hello, team!

I am currently experimenting with the Wasm version of Draco and trying to embed it in a Wasm runtime called WasmTime in .NET. I have encountered an issue where I need to provide 4 functions to use the `draco_decoder_gltf.wasm`. However, since I am using the already compiled file in the javascript folder of this repository, the function names are mangled and I do not know what needs to be implemented. I am currently investigating this issue and would appreciate any guidance on what is expected by Draco to be imported in order to make it work in a Wasm environment.

Thank you!