GGUF parser: support big-endian files

[julien-c]

The important snippet is:

const [littleEndian, version] = (() => {
	/// https://github.com/ggerganov/llama.cpp/issues/3957
	/// Assume this code is always running on little-endian
	/// but wants to be able to parse both endianness
	const version = r.view.getUint32(4, true);
	if (version & 65535) {
		return [true, version];
	} else {
		return [false, r.view.getUint32(4, false)];
	}
})();

from ggerganov/llama.cpp#3957 and thanks to @ggerganov comment

[julien-c]

this is the important part

[mishig25]

lgtm!