Added a Bulk Image Convertor function

[Anushlinux]

I have created a convertor.py file in which i have added the conversion logic which converts any png image to jpeg or jpg or tiff and vice-versa

Pls review the code and let me know

[Udayraj123]

Hey @Anushlinux, thanks for raising the PR for image conversion. Just one problem, you'd need to port this code onto the dev branch first. And in terms of code structure, you can follow what's added in the scripts/local folder instead of src since src will contain some code that is used directly when running OMRChecker.

Please check this comment and update your PR on top of the dev branch if possible. #213 (comment)

After that can you also check the scripts/hooks/convert_images_hook.py file in dev and see if we can import your function in that hook to have the same functionality?