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This change adds implementations of the range-based non-modifying
sequence operations to //base/util/ranges. Furthermore, it adds
implementations of required helpers such as std::invoke, std::identity,
std::ranges::begin, std::ranges::end, std::ranges::equal_to and
std::ranges::less.

Future CLs will add overloads for the remaining algorithms.

Reference:
https://eel.is/c++draft/alg.nonmodifying

Bug: 1071094
Change-Id: I0cab296f3937de205583408638e9be2f79473768
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944358Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772376}