Expose Connectivity libraries to VCN and tests

This patch exposes Connectivity libraries to allow migrating VCN to
its own non-updatable framework and service libraries. It also
creates a utility library for VCN.

Bug: 369703242
Test: atest FrameworksVcnTests && atest CtsVcnTestCases
Flag: EXEMPT no functional change
Change-Id: I1981f1cc824dcf426a76a0af8e4e3460fccb754e
5 files changed