gguf : add input validation, prevent integer overflows (#709)

gguf : add input validation, prevent integer overflows (#709)

* gguf : add input validation, prevent integer overflows

ggml-ci

* gguf : fix switch default case

* gguf : sanitize info->n_dims and info->type

ggml-ci

* gguf : assert GGUF_TYPE_SIZE access

ggml-ci

* ggml : assert mallocs are successful

ggml-ci

* gguf : prevent integer overflow

* gguf : sanitize tensor info

ggml-ci

* gguf : stricter limit on the number of items

ggml-ci