add track_caller attribute to map_err and ok_or/_else

[yaahc]

Motivation unicode-org/icu4x#4048

This PR resolves a common edge case where users attempting to manually track std::panic::Locations of their callers in their Error types end up with irrelevant locations inside of std.

The main concern with this approach that I'm aware of is that #[track_caller] increases the stack sizes of the functions it is applied to, though I think this is a non-issue since we already have #[track_caller] on Result's FromResidual impl which is used far more frequently than any of these APIs when converting errors between different types. This change brings these functions in line with that impl.

example demonstrating the issue: https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=8205bcd02b380d9fd02b1f1153ac9c4e

[rustbot]

r? @thomcc

rustbot has assigned @thomcc.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[yaahc]

Relevant previous discussion: #91752