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This CL adds ESimManager class and mojo interface.
ESimManager communicates with Hermes, the ChromeOS
eSIM LPA daemon, to provide eSIM management methods
over mojo. See http://go/cros-esim-design-doc for
details.

An in-process instance of ESimManager is owned in Ash
in the same way as network_config service.

Bug: 1093185
Change-Id: I444ae644d020c7df7eea68025d1cb479cdec7c11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315925
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798685}