ggml : fix quantized cpy op (#12310)
* ggml : fix quantized cpy op
ggml-ci
* tests : add cpy tests for all types
ggml-ci
* tests : add BF16 copy tests
ggml-ci
* tests : fix loop for same-type copy
ggml-ci
* tests : add option to permute the dst tensor
ggml-ci
