Add a PseudonymManager to manage pseudonyms

Bug: 239710602
Test: atest com.android.server.wifi, atest android.net.wifi
Change-Id: I784a3a07ffb8c029d3c3d9ef60806dbabb4abd13
Merged-In: I784a3a07ffb8c029d3c3d9ef60806dbabb4abd13
6 files changed