Add Hotspot WPA3 Settings

- Add WPA3 SAE security types
  - "WPA3-Personal"
  - "WPA2/WPA3-Personal"

- Verify valid WPA3 password

- Enable QR code scanner for Hotspot WPA3

- Avoid null point exception when settings keyword searching

- Screenshot
  https://screenshot.googleplex.com/B6u54wh8w35Xnyf
  https://screenshot.googleplex.com/8hWHHUTb6UaS9vB

Bug: 167968488
Test: manual test
- atest WifiTetherSecurityPreferenceControllerTest
- atest WifiUtilsTest

Change-Id: I2992040498f8add107a4cce70a92c1c6ee6ab805