Revert "Revert "Revert "Add VpnServiceBuilderShim for VpnService..."

Revert submission 1931760-reland-vpn-impl-part-2

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=aosp-master&target=test_suites_x86_64&lkgb=8053795&lkbb=8053908&fkbb=8053828, bug b/213588956.
BUG: b/213588956
Reverted Changes:
Ic8ed8fce7:Revert "Revert "Add CTS tests for exclude VPN rout...
I07104340a:Revert "Revert "Add VpnServiceBuilderShim for VpnS...
I7c69b7244:Revert "Revert "Add APIs that allow to exclude rou...

Change-Id: I53802190aafcc445fdc097410bf9cab345060418