Implement AppStateHelper#hasActiveNetwork

An app is said to be network active if it has sent
or received network data over the pas 10 minutes.

For now we monitor only WIFI and mobile network.
This should cover most cases of network usage.

Bug: 235306967
Test: atest CtsStagedInstallHostTestCases
Change-Id: Iac49bd83202932fc7a411cdc8a97e0a949c3f691