Add Insets dumps and IME debug logs

Add more dumps and logs to better help debug IME insets better
Logging can be enabled by setting InsetsController.DEBUG to true.

Bug: 154348613
Test: manually build and flash.
      Verify showing and hiding IME shows logs.
      verify adb shell dumpsys window windows has new dumps

Change-Id: Iad0a21d81a22d6acfaaf5c5ca8b5131eec411e79