Use DeviceEventLogSource for Lacros

Move DeviceEventLogSource from ash to common feedback folder. In the
case of Lacros use it to write device_event_logs into feedback reports
and into chrome://system report.

This is an initial CL for creating a systemLog API for extensions that
would support both Ash and Lacros.

Bug: 1264234
Change-Id: I6e8269eb8d4493e806a9827aa0a2fafc5bb26c4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4037661
Reviewed-by: Irem Uguz <iremuguz@google.com>
Reviewed-by: Xiangdong Kong <xiangdongkong@google.com>
Reviewed-by: Maria Petrisor <mpetrisor@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Matej Aleksandrov <maleksandrov@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1074520}