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Create and begin implementing a ScanService Mojo interface. The
interface will be used by the Scan SWA to get connected scanners, obtain
scanner capabilities, and perform scans. For now, only GetScanners() is
defined and implemented.

Subsequent CLs will add more methods and update the Scan SWA to use the
interface.

Bug: 1059779
Change-Id: Ia2511d586ea775bc35ed7549e7da63aa2a29bd10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368175
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801412}