There is a [chunks](https://docs.rs/futures-preview/0.3.0-alpha.19/futures/stream/trait.StreamExt.html#method.chunks) method for `StreamExt`. Could there be a `try_chunks` for `TryStreamExt`? The closure's domain would be `Vec<T>`, converting from `Result<T, E>`. One can produce the same result by performing the fold themselves, however it doesn't look and feel nice.
