feat(magnification settings): add logThrottled() so we only log one scale...

feat(magnification settings): add logThrottled() so we only log one scale event when they start moving the slider

Bug: 281241589
Test: atest frameworks/base/packages/SystemUI/tests/src/com/android/systemui/accessibility/WindowMagnificationTest.java
 && atest frameworks/base/packages/SystemUI/tests/src/com/android/systemui/accessibility/AccessibilityLoggerTest.java

Change-Id: If38609f5317325945e1637903c82f78024a36cdd