metal : refactor + optimize v2 #15995
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* metal : improve naming * metal : refactor device ggml-ci * cont : props ggml-ci * metal : apply ggml_mem_ranges_t ggml-ci * metal : remove GGML_METAL_USE_BF16 ggml-ci * metal : refactor device buffer ggml-ci * cont : fix naming * metal : sync before destroying the backend ggml-ci * metal : refactor context ggml-ci * metal : migrate ggml-metal.m to ggml-metal.cpp ggml-ci * metal : adjust ops API ggml-ci * metal : use C++ to store piplienes ggml-ci * metal : migrate ops to separate functions ggml-ci * metal : add ggml_metal_library_t ggml-ci * metal : improve naming ggml-ci * metal : cleanp ggml-ci * metal : add support for GGML_OP_LOG ggml-ci * metal : fix error handling ggml-ci
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Major refactoring of the Metal backend to make the implementation safer and more manageable:
ggml-metal-device.hand move device code thereggml-metal-context.hand move backend context code thereggml_metal_encode_nodeinto per-op functions and move them to separate sourcestypedef struct ggml_mem_ranges * ggml_mem_ranges_t;