fix: set runtime path

[zhyncs]

Motivation

readelf -d /usr/local/lib/python3.10/dist-packages/sgl_kernel/ops/warp_reduce_cuda.*.so | grep RPATH
 0x000000000000000f (RPATH)              Library rpath: [$ORIGIN/../../torch/lib]

Modifications

Checklist

• Format your code according to the Contributor Guide.
• Add unit tests as outlined in the Contributor Guide.
• Update documentation as needed, including docstrings or example tutorials.