Round 2 / TreeD-GPU

Utilize GPU to build TreeD, supporting multi-GPU parallel computation:

• GPU-Accelerated TreeD Construction: treed_gpu leverages GPU acceleration to compute the TreeD data structure, significantly increasing speed compared to CPU multi-threading.
• Multi-GPU Support: Enables computation across multiple GPUs simultaneously, further enhancing processing speed.
• Efficient Merkle Tree Construction: Builds a Merkle tree to ensure data integrity and tamper-proof storage.