Add ranges::find_last*

[akukanov]

The implementation approach is to redirect to find_if with reverse_view, and then create a proper subrange to return.

[dmitriy-sobolev]

LGTM

[SergeyKopienko]

@akukanov, what about iterator variants of find_last described at https://en.cppreference.com/cpp/algorithm/ranges/find_last ?

[akukanov]

what about iterator variants of find_last described at https://en.cppreference.com/cpp/algorithm/ranges/find_last ?

We intentionally focus on the range-based API and do not add any iterator variants for range algorithms - so far, including those that have no direct analogues in C++17 (for example, max/min/minmax). The oneDPL specification does not include these either. That can be revisited later in case there is demand.

[danhoeflinger]

LGTM

[SergeyKopienko]

LGTM