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* CANN: implement LRU cache for ACL graphs in CANN backend - Introduce ggml_cann_graph_lru_cache to store multiple ggml_cann_graph objects. - Graphs are loaded on demand and evicted using LRU policy when capacity is exceeded. - Updated push, move_to_front, and clear methods to manage cached graphs efficiently. - Ensures reuse of graphs, reducing graph reconstruction overhead in CANN backend. * fix typo * The LRU cache capacity can be configured via an env variable Signed-off-by: noemotiovon <757486878@qq.com> * refactory acl graph * refactory && fix review comments Signed-off-by: noemotiovon <757486878@qq.com> --------- Signed-off-by: noemotiovon <757486878@qq.com>