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Fully implements the DoNotDisturbController. This class is responsible
sending and receiving states in regards to the DoNotDisturb feature of
the user's phone.

Bug: 1106937
Test: chromeos_components_unittests
Change-Id: I6a4fa96de5920711a7534ae7eff8bb33b9bb35b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439777
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813420}