Create scanner package

[Jupi007]

This package should totally abstract SANE.

final finder = ScannerFinder();
final scanner = finder.lookup().first;

scanner.configure(
  ScanOptions(
    mode: ScanMode.color,
    resolution: 600,
    ...
  )
);
final scanStream = scanner.scan();

[Craftplacer]

What about other scanning libraries like Windows Image Acquisition, etc.? Is it also in the scope of that library?

[Jupi007]

The goal is to provide a generic interface, on which other scanning library can be plugged on.

[Craftplacer]

We maybe should specify/design the API first before we start implementing/working on it.

Maybe do a bit of research: how do the APIs of other OS scanning libraries look like?