Introduce PictureColorModePreferenceController

- Create new PictureColorModePreferenceController
 - Create controller inside the DashboardFragment
 - Refactor ColorModePreference so isAvailable() no longer depends on
 ColorModePreference
 - Port logic from DevelopmentSettings into the controller

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: I8dff5b0d5ad1d7f043fc7ead540b2c0c960933e3

tests/robotests/src/com/android/settings/development/DevelopmentSettingsDashboardFragmentTest.java

@@ -112,6 +112,9 @@ public class DevelopmentSettingsDashboardFragmentTest {
     }
 
     @Test
+    @Config(shadows = {
+            ShadowPictureColorModePreferenceController.class
+    })
     public void searchIndex_pageEnabled_shouldNotAddKeysToNonIndexable() {
         final Context appContext = RuntimeEnvironment.application;
         DevelopmentSettingsEnabler.setDevelopmentSettingsEnabled(appContext, true);
@@ -198,4 +201,13 @@ public class DevelopmentSettingsDashboardFragmentTest {
             mShown = true;
         }
     }
+
+    @Implements(PictureColorModePreferenceController.class)
+    public static class ShadowPictureColorModePreferenceController {
+
+        @Implementation
+        public boolean isAvailable() {
+            return true;
+        }
+    }
 }