Auto merge of #65091 - sekineh:into-iter-sorted, r=KodrAus

Implement ordered/sorted iterators on BinaryHeap as per #59278

I've implemented the ordered version of iterator on BinaryHeap as per #59278.

# Added methods:

* `.into_iter_sorted()`
  * like `.into_iter()`; but returns elements in heap order
* `.drain_sorted()`
  * like `.drain()`; but returns elements in heap order
  * It's a bit _lazy_; elements are removed on drop. (Edit: it’s similar to vec::Drain)

For `DrainSorted` struct, I implemented `Drop` trait following @scottmcm 's [suggestion](https://github.com/rust-lang/rust/issues/59278#issuecomment-537306925)

# ~TODO~ DONE
* ~I think I need to add more tests other than doctest.~

# **Notes:**
* we renamed `_ordered` to `_sorted`, because the latter is more common in rust libs. (as suggested by @KodrAus )

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