Refactor staticlibs

This CL introduces net-utils-framework-connectivity, net-utils-tethering
and net-utils-service-connectivity as staticlibs.

- net-utils-framework-connectivity will be used by
  framework-connectivity-pre-jarjar.
- net-utils-service-connectivity and net-utils-tethering are the
  static liraries used by service-connectivity-pre-jarjar and Tethering
  respectively.

Bug: 350699020
Test: CI

Change-Id: I4dbb2b0de905a576cfcf24d2d5d1f1a261d2bd68
5 files changed