[SYCL] Add SYCL Backend registry, device and Event Interfaces#9705

OuadiElfarouki merged 12 commits intoggml-org:masterggml-org/llama.cpp:masterfrom

OuadiElfarouki:sycl_async_data_loadOuadiElfarouki/llama.cpp:sycl_async_data_loadCopy head branch name to clipboard