[BUG] Wrap #pragma nv_* in macro that is enabled only for nvcc

[ttnghia]

The pragma #pragma nv_* is used in many places like this:

• cudf/cpp/include/cudf/utilities/type_dispatcher.hpp

  Line 436 in ebe4757

  #pragma nv_exec_check_disable

• cudf/cpp/include/cudf/column/column_view.hpp

  Line 332 in ebe4757

  #pragma nv_exec_check_disable

• Several other places.

However, these #pragma nv_ are defined only for nvcc compiler. Host compilers don't understand them. Thus, they may issue warnings due to unknown pragma, such as:

In file included from /opt/conda/conda-bld/work/cpp/include/cudf/column/column_view.hpp:22,
                 from cudf_kafka/_lib/kafka.cpp:967:
/opt/conda/conda-bld/work/cpp/include/cudf/utilities/type_dispatcher.hpp:436: warning: ignoring '#pragma nv_exec_check_disable ' [-Wunknown-pragmas]
  436 | #pragma nv_exec_check_disable

We should wrap these #pragma nv_ into macro so only nvcc can see them. For example:

#ifdef __CUDACC__
#pragma nv_exec_check_disable
#endif