Pietro Albini 0f8343830b
Rollup merge of #51511 - Centril:feature/stabilize_iterator_flatten, r=SimonSapin
Stabilize Iterator::flatten in 1.29, fixes #48213.

This PR stabilizes [`Iterator::flatten`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.flatten) in *version 1.29* (1.28 goes to beta in 10 days, I don't think there's enough time to land it in that time, but let's see...).

Tracking issue is:  #48213.

cc @bluss re. itertools.
r? @SimonSapin
ping @pietroalbini -- let's do a crater run when this passes CI :)
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