[heycam/webidl] Annotations for what may throw (#603)

Should add `[Throws]` to WebIDL? This is a Mozilla-specific extended attribute which indicates which operations may throw. @fitzgen commented to me that this is very useful for [web-sys](https://rustwasm.github.io/wasm-bindgen/web-sys/index.html), the wasm-bindgen component which Rust WebAssembly uses to call WebIDL APIs.

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