[Feature request] GmsDocumentScanner API cropping + Page Limit

[talhaazhar]

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
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