Build scanner binary component (for F-Droid/etc scanning support)

the scanner binary component is OSS yet it means that nextcloud would need to build and include a build process for this binary shipped by the scanner lib dependency ourselves.

So anybody could build and contribute this but it is currently not a priority for Nextcloud. So we are happy to see folks contributing this in order to also have document scanning capabilities in the f-droid version. 👍

Originally posted by @AndyScherzinger in https://github.com/nextcloud/android/issues/10195#issuecomment-1881836396