Make iter::order functions into methods on Iterator
This does cause some breakage due to deficiencies in resolve - `path::Components` is both an `Iterator` and implements `Eq`, `Ord`, etc. If one calls e.g. `partial_cmp` on a `Components` and passes a `&Components` intending to target the `PartialOrd` impl, the compiler will select the `partial_cmp` from `Iterator` and then error out. I doubt anyone will run into breakage from `Components` specifically, but we should see if there are third party types that will run into issues. `iter::order::equals` wasn't moved to `Iterator` since it's exactly the same as `iter::order::eq` but with an `Eq` instead of `PartialEq` bound, which doensn't seem very useful. I also updated `le`, `gt`, etc to use `partial_cmp` which lets us drop the extra `PartialEq` bound. cc #27737
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