NIXL Python API

NIXL is a Python API meta-package designed to simplify the installation and usage of NIXL's core functionalities across various CUDA versions. It automatically detects the system's CUDA environment and installs the appropriate `nixl-cudaXXX` sub-package, providing a unified `nixl.core` interface for tensor operations, device management, and more. Current version is 1.0.0, with releases tied to new CUDA variant support.