Default setup wizard to use PIN

- Added "Screen lock options" button in PIN screen, controlled by
  extra EXTRA_SHOW_OPTIONS_BUTTON, which will create a dialog to ask
  the user to choose another screen lock type.
- Extracted ScreenLockType enum and ChooseLockGenericController that
  can be shared by ChooseLockGeneric and the dialog
  ChooseLockTypeDialogFragment.
- The intent extra EXTRA_SHOW_OPTIONS_BUTTON will be set if
  ChooseLockGeneric screen starts ChooseLockPassword /
  ChooseLockPattern without asking the user. (Although the extra is
  ignored by ChooseLockPattern currently)
- Fix layout alignment for the password entry field to remove the
  extra 4dp padding on the sides.

Test: cd tests/robotests && mma
Bug: 35442933
Bug: 38002299
Change-Id: I877fbe08a0c05bb97175e1cbf0260ea6dbda22e2

src/com/android/settings/password/ManagedLockPasswordProvider.java

@@ -52,7 +52,7 @@ public class ManagedLockPasswordProvider {
      * Should be overridden if {@link #isManagedPasswordSupported()} returns true.
      * @param forFingerprint Whether fingerprint unlock is enabled.
      */
-    String getPickerOptionTitle(boolean forFingerprint) { return ""; }
+    CharSequence getPickerOptionTitle(boolean forFingerprint) { return ""; }
 
     /**
      * Gets resource id of the lock screen preference that should be displayed in security settings