Add aggressive query mode

The current query scan modes, active and passive, have
limitations. Unicast queries only originate from the first query
session, multicast queries should be sent simultaneously with
unicast, and both modes suffer from infrequent scans. To
address these shortcomings, a aggressive query mode is proposed.

Bug: 271067818
Test: atest FrameworksNetTests NsdManagerTest
Change-Id: I87100e03a5b6306dcae79f05c034f000e6dc2889