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Create the LorgnetteScannerManager to manage all available scanners in
Chrome OS. Clients can request the names of available scanners and use
them to perform scans.

The manager obtains available scanners using a ZeroconfScannerDetector
and the lorgnette D-Bus service. It deduplicates the scanners before
giving their names to clients and then uses the lorgnette D-Bus service
to perform scans.

Bug: b:153541027
Change-Id: I4e93ee7a97e3c06ec8b6390db79997c1441eac7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318310Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797901}