ScanOnlyModeManager: add basic states and controls

Start populating the scan mode manager with basic states and constructs.
This is an initial building block and is not yet functional.

Bug: 32659843
Bug: 32436466
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Change-Id: Id4b05459fecec6d83cee54b95d74d162cf6b7c2a
5 files changed