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process: add Child::{wait,try_wait} (#2796)
* add Child::try_wait to mirror the std API * replace Future impl on Child with `.wait()` method to bring our APIs closer to those in std and it allow us to internally fuse the future so that repeated calls to `wait` result in the same value (similar to std) without forcing the caller to fuse the outer future * Also change `Child::id` to return an Option result to avoid allowing the caller to accidentally use the pid on Unix systems after the child has been reaped * Also remove deprecated Child methods
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