Remove injecting developer options into Settings itself

- It can improve performance because we use less injected item
- Also use RestrictedPreference instead just checking restrictions,
  so we follow policy transparency.

Note: Renamed DevelopmentSettingsDashboardActivity to
DevelopmentSettingsActivity,
because DevelopmentSettingsDashboardActivity could in disabled state
even after Settings upgrades, use a new name to prevent this issue.

Bug: 311604902
Test: manual - turn on / off Developer Options
Test: unit test
Change-Id: I17be117ae59e59410687e6d08fd5edd034d0508f

src/com/android/settings/Settings.java

@@ -134,7 +134,7 @@ public class Settings extends SettingsActivity {
     public static class HighPowerApplicationsActivity extends SettingsActivity { /* empty */ }
     public static class BackgroundCheckSummaryActivity extends SettingsActivity { /* empty */ }
     public static class StorageUseActivity extends SettingsActivity { /* empty */ }
-    public static class DevelopmentSettingsDashboardActivity extends SettingsActivity { /* empty */ }
+    public static class DevelopmentSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilitySettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilityDetailsSettingsActivity extends SettingsActivity { /* empty */ }
     public static class CaptioningSettingsActivity extends SettingsActivity { /* empty */ }