[libcxx] adds concepts std::equality_comparable[_with]

Implements parts of:
    - P0898R3 Standard Library Concepts
    - P1754 Rename concepts to standard_case for C++20, while we still can

Depends on D96660

Reviewed By: ldionne, #libc, Quuxplusone

Differential Revision: https://reviews.llvm.org/D97176

GitOrigin-RevId: e63ddcccf8dbe5cdd348b791f3beb7afe3a1a71c
4 files changed