Add interface types support

[mfateev]

Thanks for proposing a new feature!

Motivation

I would like to embed Go wasm code. Currently Go comes with syscall/js bindings. Having them implemented in go-ext-wasm would allow easy communication with the hosted Go code.

Proposed solution

Implement API bindings to syscall/js.

Alternatives

The better alternative would be a native way to bind to the hosted Go process functions. Ideally allowing more complex argument types like structures.

[mfateev]

It looksl ike interface types is the way to go: https://hacks.mozilla.org/2019/08/webassembly-interface-types/

[Hywan]

WebAssembly Interface Types (WIT) has changed a lot since the Mozilla blog post. We are working on implementing it, see wasmerio/wasmer#787. I think it will drastically change the Wasm landscape.