WifiManager: Add verbose logging enabled flag

Some of the wifimanager logs on the app side are too spammy. Move these
logs under a verbose logging flag. This flag is updated to reflect the
logging level set on wifi service when the WifiManager object is created.

Bug: 111350569
Test: Ensured that the logs under the flag are logged only when verbose
logging is turned on.

Change-Id: Ied1ee14b423e4d0a473e153dcfd3e07e20391be5