[AF02.1] Support read by FastDataInput in the NetworkStatsRecorder

This increased reading performance by 35% while running
benchmark tests. But the feature is not enabled in the production
code until the service turns it on.

Test: atest ConnectivityBenchmarkTests
Test: atest ConnectivityCoverageTests:android.net.connectivity.android.net.NetworkStatsCollectionTest
Bug: 313841499

Change-Id: Ic827e6c4848cc31d46d62aa93993b483114a1f12