Support 1-byte and 2-byte types with atomic_ref

[PointKernel]

We are replacing custom atomic implementations in libcudf with cuda::atomic_ref (rapidsai/cudf#13575). The current atomic_ref would work fine with 4-byte or 8-byte integers and floating points but doesn't support time types like durations or timestamps from cuda/std/chrono. Also, it would be great to have atomic_ref support 1-byte and 2-byte types like bool, int8_t and int16_t. The functions we are mostly interested in are fetch_min, fetch_max and fetch_add.

For your reference, here is the list of time types used in libcudf:
https://github.com/rapidsai/cudf/blob/2ca46306aad848f5102314374cef1c026856569e/cpp/include/cudf/wrappers/durations.hpp
https://github.com/rapidsai/cudf/blob/2ca46306aad848f5102314374cef1c026856569e/cpp/include/cudf/wrappers/timestamps.hpp

[PointKernel]

https://godbolt.org/z/a78x4qrha

It works! 🔥