introduce image editor to reduce image file size

[noymer]

Informations

Is your feature request related to a problem? Please describe.
When MAX_FILE_SIZE is set, but you want to upload larger image files, you will fail to upload.

Describe the solution you'd like

It's good to edit, especially crop and resize images on GROWI to reduce file size.

Describe alternatives you've considered

Add image editor on GROWI.
Luckily, there are many useful OSSs like

• ValentinH/react-easy-crop: A React component to crop images/videos with easy interactions
• DominicTobias/react-image-crop: A responsive image cropping tool for React
• etc.