A way to await on the output of either of two futures

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Example

```rust use futureslite::future; use futureseither::{either, Either};

let out = either( async { 42 }, async { false }, ).await; assert_eq!(out, Either::Left(42));

let out = either( future::pending::(), async { 42 }, ).await; assert_eq!(out, Either::Right(42)); ```

License

This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.