Re: [whatwg/webidl] Rename the `async iterable` declaration to `async_iterable` to match the type name. (Issue #1504)

tabatkins left a comment (whatwg/webidl#1504)

> We cannot use the same name for the two different concepts, because then the grammar is ambiguous (not LL(1)): you don't know whether you're parsing a declaration or a type until after you see the next token.

Ahhh, I didn't realize *that* was actually the grammar issue. That makes sense!

Then yeah, I think using `async_sequence` for the value type would make a lot of sense, to pull it farther away.

We should *probably* be consistent in underscore use between the two instances, I guess? I'd be fine with `async_iterator` for the interface declaration, but is the other way possible? Does `async sequence<...>` violate LL(1)? (I think either way is fine.)

@saschanaz I can do the change, if we know what we're agreeing to.

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