Embed yolo files to model(gguf) file

[katsu560]

Some app like yolov3-tiny needs additional files to execute such as label(coco.names) and alphabet labels(100_0.png, ...) files. If these files are embedded to a model(gguf) file and the app read them from the model file, the app is more portable.

I added below

• added new GGUF_TYPE_NAMEDOBJECT with name(file path) and value(file body) for adding files to gguf
• expanded gguf-py to support NAMEDOBJECT, constants.py, gguf_reader.py, gguf_writer.py
• added gguf-addfile.py script to add files to gguf file
  • add files as NAMEDOBJECT (general.namedobject.N) or add files as NAMEDOBJECT array (general.namedobject[N] with --array option)
• expanded ggml to support NAMEDOBJECT, ggml.h ggml.c
• expanded yolov3-tiny to read coco.names and alphabet labels from gguf file,
  • at first read from gguf, then read from file if failed from gguf

NAMEDOBJECT constructed from name(file path) and value(file body)

    struct gguf_nobj {
        uint64_t nname;  // length of name
        char   * name;   // name in utf8
        uint64_t n;      // length of data in bytes
        char   * data;   // data body (file body)
    };

script usage:

python3 gguf-addfile.py [--array] input-gguf-file output-gguf-file files ...