Optimize file size for .json storage by up to 80%.

[kompaqt]

Hi there,

first of all a big thanks for this great framework! An absolute gamechanger for many of our projects.

For full page ocr (220 files), it allowed reduction by 80%. Since it seems the .json file is written in C++, I'm not able to provide the pull request.

A quick way to reduce file size on python side for inference output.

with open(path, mode="w", encoding="utf-8") as outfile:
    json.dump(data, outfile, separators=(",", ":"))