1/ Make One handed mode support multiple user switch

Previously OHM did not support for multile user switch
Now we hook SysUI onUserSwitch callback to update
latest one handed mode functionality by currentUserId

Test: atest SystemUITests
Test: atest WMShellUnitTests
Test: manually switch user and observe verify different OHM config
      for different users
Bug: 182278800
Change-Id: I8ae7d0aedcafc8f477f41d2703df2df53839a89f