[MS35] Remove getNetwork[Total|Uid]Bytes dependencies from NPMS

1. getNetworkTotalBytes was used for querying overall statistics
   that regards of the NetworkPolicy to calculate the remaining
   data warning/limit quota that needs to be send to the lower layer.
2. getNetworkUidBytes was used for querying overall statistics of
   apps to find out the rapid traffic that caused by an abnormal
   app behavior.

This change replaces getNetwork[Total|Uid]Bytes with APIs that are
about to expose, and introduces a dependencies object for better
unit test injection.

Test: atest NetworkPolicyManagerServiceTest
Bug: 204830222

Change-Id: I802d2316fb22886e951456df0941c09176c981f8