[libcxx] adds concept `std::common_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

Differential Revision: https://reviews.llvm.org/D96683

GitOrigin-RevId: f893312c1a6a67075f2f38b22e8fd866f0d3d9db
2 files changed