Add Settings metrics to track three finger tap's launching app

Test: rebuild
Flag: com.android.settings.flags.three_finger_tap_app_launch
Bug: 413255278
Change-Id: I3912af87dd1112e721ea92f4a813c0ee99f127bc
1 file changed
tree: b00eb6f4497083ee6e2062bb7ba6e075291588bc
  1. stats/
  2. OWNERS