Rollup merge of #82331 - frol:feat/std-binary-heap-as-slice, r=Amanieu

alloc: Added `as_slice` method to `BinaryHeap` collection

I initially asked about whether it is useful addition on https://internals.rust-lang.org/t/should-i-add-as-slice-method-to-binaryheap/13816, and it seems there were no objections, so went ahead with this PR.

> There is [`BinaryHeap::into_vec`](https://doc.rust-lang.org/std/collections/struct.BinaryHeap.html#method.into_vec), but it consumes the value. I wonder if there is API design limitation that should be taken into account. Implementation-wise, the inner buffer is just a Vec, so it is trivial to expose as_slice from it.

Please, guide me through if I need to add tests or something else.

UPD: Tracking issue #83659

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