[Feature request] GmsDocumentScanner API cropping + Page Limit

**What's your feature request? Please describe.**
Can we please have the parameter to add optional padding to the cropped image? This library is a life-saver and having padding will make it perfect for our use-case.

Also, this has been flagged before but the page limit will be helpful.

Extras: option to skip the auto rotation of the image. The image is auto-rotated such that the text is always horizontal

**Mobile environment**
Android

**Additional context**
Add any other context or screenshots about the feature request here.