Re: [whatwg/streams] add TrasformStream finally callback (PR #1231)

> one issue i currently havent handled yet is what to do in case the `finally` callback is a promise. The call in the flushPromise fulfilled case should be easier, however the other call in `transformStreamErrorWritableAndUnblockWrite`, unsure how to proceed.

Handling this is complicated, since `TransformStreamErrorWritableAndUnblockWrite` is making it so writing to the writable stream will throw, and this cannot be delayed until the `finally` promise resolves. So the `finally` callback can't work in a similar way to `Promise.prototype.finally`.

Can we ignore the returned promise and let it cause an unhandled promise rejection?

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