Dump magnification tracking typing focus info for dumpsys accessibility

To make the magnification debugging easier, we add the dump information
for magnification tracking typing focus feature.

For full screen magnification, it includes
MagnificationFollowTypingEnabled.

For window magnification, it includes both
MagnificationFollowTypingEnabled and TrackingTypingFocusEnabled.

MagnificationFollowTypingEnabled is controlled by system preference
setting.

TrackingTypingFocusEnabled is controlled by a user behavior.

Bug: 216208936
Test: manual - Turn on the magnifier
      $adb shell settings put secure
          accessibility_magnification_follow_typing_enabled 0/1
      $adb shell dumpsys accessibility
Change-Id: Id584ece3b2e3d9b849ff1275b55f4fd0ba09a6b8