Emit sorted dir-diff result as soon as preceding results get ready #603
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If the directory diff contains lots of changes across files, it's better to
emit earlier results incrementally.
The idea is borrowed from the following thread. The diff producer assigns
incremental index, and the consumer puts the results in BinaryHeap to reorder
them by index.
https://users.rust-lang.org/t/parallel-work-collected-sequentially/13504/3