gguf-py : add support for endian conversion of BF16 data (#16594) BF16 requires special handling in this script while it's a 2-bytes data, but view is 1-byte by default. Switch to correct view before attempting byteswapping. With this change correctly byteswapping models like Meta-Llama-3-8B-Instruct-bf16-GGUF should be possible.