Add idle threshold levels to ddc

- Add idle screen brightness mode threshold tuning to ddc
- Migrate existing threshold tuning to ddc.
- Add tests for all thresholds in the ddc.

Bug: 242267499
Test: adb shell dumpsys display | grep -A4 HysteresisLevels
Test: atest com.android.server.display

Change-Id: I9e67aa60609c4202321477a001504d29028d7f6b
Merged-In: I9e67aa60609c4202321477a001504d29028d7f6b