consider switching to another argument parser to support type checks

[rom1504]

https://github.com/google/python-fire/issues/226 fire doesn't support it

no checks can cause issues such as https://github.com/rom1504/img2dataset/issues/54

another way to tackle this could be to do manual checks

[robvanvolt]

I had issues with subprocess and list-arguments too, will pull request a hot fix soon!