[Task] Make entities defined by DECLARE_LAUNCH_WRAPPER stream aware #11346

This issue tracks extracting a portion of #10898 that extends the conventional C2H launch helpers with stream-aware execution.

Callables generated by DECLARE_LAUNCH_WRAPPER and DECLARE_TMPL_LAUNCH_WRAPPER accept a stream-like object supported by cuda::get_stream as their first argument. A direct launch(stream, action, ...) API is also provided. The wrapper macros themselves remain unchanged.

The motivation is to support the eventual migration of CUB tests to cuda::buffer, where buffer initialization and algorithm execution must be correctly ordered on a caller-provided stream.

The behavior depends on value of TEST_LAUNCH preprocessor variable test was compiled with:

• TEST_LAUNCH == 0: the supplied stream is passed directly to the CUB API.
• TEST_LAUNCH == 1: because a host stream handle cannot be used from device code, the supplied stream is synchronized before the CDP launch begins. The CUB API is then invoked device-side using its default stream.
• TEST_LAUNCH == 2: the supplied stream is used for the temporary-storage query, CUDA graph capture, graph execution, and synchronization.

Each launch mode is tested independently, including direct launch and wrapper calls using cuda::stream_ref, cudaStream_t, and a custom type exposing get_stream() method.

Environment-based launch wrappers are not changed by this work.