Add Network security watchlist service

Network security watchlist service is a service to monitor all potential
harmful network traffic. By setting a network watchlist, any connections
that visit any site from watchlist will be logged.

Logs will be aggregated everyday and encoded using differential
privacy before exporting it from framework.

This feature is disabled now, run "setprop ro.network_watchlist_enabled true" to enable it.

All network events are handled in an async bg thread, it should not
cause any delay in netd. Also, it uses the hooks in enterprise network logging,
so we can run netd_benchmark to measure the impact to netd.

Here are the things not included in this CL:
- ConfigUpdater to get and set watchlist
- Differential privacy encoding logic and reporting
- CTS
- Memory and performance optimization for internal watchlist data structure

Test: manual - turn on the feature, hard code a watchlist xml, process
that visited that domain is being logged in sqlite.
Test: run netd_benchmark - seems no obvious performance change.
Test: bit FrameworksCoreTests:android.net.NetworkWatchlistManagerTests
Test: runtest frameworks-net
Test: runtest frameworks-services -p com.android.server.net.watchlist

Bug: 63908748

Change-Id: I09595178bac0070a867bc5e0501a7bf2c840e398

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