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This class is responsible for discovering endpoints via the Nearby
Connections library. It uses an out-of-band Bluetooth discovery
mechanism since SecureChannel already has access to a Bluetooth MAC
address for the device we're aiming to connect to.

This CL also adds a nearby_connector.mojom file which contains the
service ID to use for SecureChannel connections over Nearby Connections.
Follow-up CLs will add additional interfaces to this file.

Bug: 1106937
Change-Id: I66b20d960823bf3e8429dbfa863e84b123e29deb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506551
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#824992}