Implement OP_SYSTEM_EXEMPT_FROM_POWER_RESTRICTIONS exemption

OP_SYSTEM_EXEMPT_FROM_POWER_RESTRICTIONS details:
* An app with this appop will be made exempt from all
  power restrictions, including app standby and doze.
* In addition, the app will be able to start fgs from
  the bg, and the user will not be able to stop fgs
  run by the app.

Changes:
* Implement the OP_SYSTEM_EXEMPT_FROM_POWER_RESTRICTIONS

Bug: 246330879
Test: atest PowerAllowlistBackendTest

Manual testing:
- Give OP_SYSTEM_EXEMPT_FROM_POWER_RESTRICTIONS appop to TestDPC app
- Verify the app can start fg services from the bg
- Verify fgs started by the app cannot be stopped
- Verify the app cannot be put into background restricted via Settings

Change-Id: If9e76076c59195f1e6e5f3eee3c8e7a0c754d8de

tests/robotests/src/com/android/settings/fuelgauge/BatteryUtilsTest.java

@@ -398,7 +398,8 @@ public class BatteryUtilsTest {
     @Test
     public void testShouldHideAnomaly_AppInDozeList_returnTrue() {
         doReturn(new String[]{HIGH_SDK_PACKAGE}).when(mPackageManager).getPackagesForUid(UID);
-        doReturn(true).when(mPowerAllowlistBackend).isAllowlisted(new String[]{HIGH_SDK_PACKAGE});
+        doReturn(true).when(mPowerAllowlistBackend)
+                .isAllowlisted(new String[]{HIGH_SDK_PACKAGE}, UID);
 
         assertThat(mBatteryUtils.shouldHideAnomaly(mPowerAllowlistBackend, UID,
                 mAnomalyInfo)).isTrue();