RFC for zip_view implementation, for oneDPL C++20

rfcs/proposed/zip_view/README.md

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+# zip_view Support for the oneDPL Range APIs with C++20
+
+## Introduction
+`std::ranges::zip_view` is powerful utility enables developers to combine two or more ranges into a single view,
+where each element is represented as a tuple containing corresponding elements from each input range.
+
+## Motivations
+`std::ranges::zip_view` is a convenient way to combine multiple ranges into a single view, where each element of
+the resulting range is a tuple containing one element from each of the input ranges. This can be particularly
+useful for iterating over multiple collections in parallel. `std::ranges::zip_view` is introduced starting with C++23,
+but there are many users who work with C++20 standard yet. So, oneDPL introduces `oneapi::dpl::ranges::zip_view`,
+which the same API and functionality as `std::ranges::zip_view`.
+
+### Key Requirements
+`oneapi::dpl::ranges::zip_view` should be:
+- compilable with C++20 version (minimum)
+- API compliant with `std::ranges::zip_view`
+- random accessible view; the "underlying" views also should be random accessible
+- in case of a device usage: a device copyable view itself and the "underlying" views also should be device copyable
+
+`oneapi::dpl::ranges::zip_view::iterator` should be:
+- value-swappable (https://en.cppreference.com/w/cpp/named_req/ValueSwappable)
+- convertible to `oneapi::dpl::zip_iterator`
+- abble to use with the non-range algorithms
+
+### Performance
+TBD