GestureNav: Log exclusion rect heights

Logs the rejected and requested exclusion rect heights.

Test: adb shell device_config put android:window_manager key_system_gesture_exclusion_log_debounce_millis 1000
Bug: 135152789
Change-Id: Ie12640f4bf0a8b40b666e604188a0bedd85e8981
Exempt-From-Owner-Approval: DeviceConfig.java: Adding constant to WindowManager namespace.