currently Iterator is in https://github.com/sindresorhus/globals/blob/main/data/worker.mjs#L136, https://github.com/sindresorhus/globals/blob/main/data/nodeBuiltin.mjs#L32, but not in any of the ES* file

it is a JavaScript interface available in all scope, so it is better to place it in ES* file

also, it is not in browser.mjs or serviceworker.mjs currently