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Rollup merge of rust-lang#62205 - timvermeulen:iter_order_by, r=KodrAus
Add Iterator comparison methods that take a comparison function This PR adds `Iterator::{cmp_by, partial_cmp_by, eq_by, ne_by, lt_by, le_by, gt_by, ge_by}`. We already have `Iterator::{cmp, partial_cmp, ...}` which are less general (but not any simpler) than the ones I'm proposing here. I'm submitting this PR now because rust-lang#61505 has been merged, so this change should not have a noticeable effect on the `Iterator` docs page size. The diff is quite messy, here's what I changed: - The logic of `cmp` / `partial_cmp` / `eq` is moved to `cmp_by` / `partial_cmp_by` / `eq_by` respectively, changing `x.cmp(&y)` to `cmp(&x, &y)` in the `cmp` method where `cmp` is the given comparison function (and similar for `partial_cmp_by` and `eq_by`). - `ne_by` / `lt_by` / `le_by` / `gt_by` / `ge_by` are each implemented in terms of one of the three methods above. - The existing comparison methods are each forwarded to their `_by` counterpart, passing one of `Ord::cmp` / `PartialOrd::partial_cmp` / `PartialEq::eq` as the comparison function. The corresponding `_by_key` methods aren't included because they're not as fundamental as the `_by` methods and can easily be implemented in terms of them. Is that reasonable, or would adding the `_by_key` methods be desirable for the sake of completeness? I didn't add any tests – I couldn't think of any that weren't already covered by our existing tests. Let me know if there's a particular test that would be useful to add.
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