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- Split networks list into default and cellular
- Cellular contains eSIM, SIM and Tether networks
- Add new string describing each network

Screenshot: https://screenshot.googleplex.com/7EE62daLS47D2Y2.png
Design: https://docs.google.com/presentation/d/1Mfk5ZMEmeHwSbadUbyRU0Si5k6XDIvw-j4u7TUaCIGY/edit#slide=id.g9091f1bab9_0_26

Bug: 093185
Change-Id: I4545cb272b086dfe7e9f64037a51465fc5ff80a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505937
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825854}