Add window trace status to the bug report

Add the window trace status when dumping the WM service for the
bugreport.

The status include:
- Enabled or not
- Log level (0 - all, 1 - trim or 2 - critical)
- Buffer size
- User buffer space
- Number of elements in the buffer

Test: Run `dumpsys window trace`
Change-Id: Iec43922523b5aab6f14c03f4b5999dcce8ea5dce