ggml-cpu: Add CPU backend support for KleidiAI library (#11390) * ggml-cpu: Add CPU backend support for KleidiAI library * Add environmental variable GGML_KLEIDIAI_SME * Add support for multithread LHS conversion * Switch kernel selection order to dotprod and i8mm * updates for review comments * More updates for review comments * Reorganize and rename KleidiAI files * Move ggml-cpu-traits.h to source file * Update cmake for SME build and add alignment for SME * Remove append GGML_USE_CPU_KLEIDIAI to the GGML_CDEF_PUBLIC list