Add schedule setting page for time-based modes.

Creates new layout for setting the start & end time, and days of the week, for a schedule-based mode.

This is close to the mocks specified in https://screenshot.googleplex.com/8zmb7PAjjt73VkN, but with the following differences:
- the end time is left-aligned with the center rather than on the right side of the screen. This is a side effect of using LinearLayout to evenly space start & end times, and could in theory be fixed by using a ConstraintLayout, but that option seems to cause times to overlap instead of wrap when display size is cranked up. Could be fixed later.
- no icons yet on either side of the time display
- no Done button. Instead, has the "exit at alarm" switch that exists today.

Have not yet checked how this interacts with TalkBack, etc.

Flag: android.app.modes_ui
Bug: 332730302
Test: ZenModeSetSchedulePreferenceControllerTest, ZenModeExitAtAlarmPreferenceControllerTest, ZenModeSetTriggerLinkPreferenceControllerTest
Test: manual: interacting with UI in normal size, with font & display at minimum and maximum, and in locales (fr) where the first day of the week is a different day
Change-Id: I0b76f55891d6c12fc27720657c9eea6fe42fbafe

src/com/android/settings/notification/modes/ZenModeExitAtAlarmPreferenceController.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.notification.modes;
+
+import android.content.Context;
+import android.service.notification.ZenModeConfig;
+
+import androidx.annotation.NonNull;
+import androidx.preference.Preference;
+import androidx.preference.TwoStatePreference;
+
+/**
+ * Preference controller controlling whether a time schedule-based mode ends at the next alarm.
+ */
+class ZenModeExitAtAlarmPreferenceController extends
+        AbstractZenModePreferenceController implements Preference.OnPreferenceChangeListener {
+    private ZenModeConfig.ScheduleInfo mSchedule;
+
+    ZenModeExitAtAlarmPreferenceController(Context context,
+            String key, ZenModesBackend backend) {
+        super(context, key, backend);
+    }
+
+    @Override
+    public void updateState(Preference preference, @NonNull ZenMode zenMode) {
+        mSchedule = ZenModeConfig.tryParseScheduleConditionId(zenMode.getRule().getConditionId());
+        ((TwoStatePreference) preference).setChecked(mSchedule.exitAtAlarm);
+    }
+
+    @Override
+    public boolean onPreferenceChange(@NonNull Preference preference, Object newValue) {
+        final boolean exitAtAlarm = (Boolean) newValue;
+        if (mSchedule.exitAtAlarm != exitAtAlarm) {
+            mSchedule.exitAtAlarm = exitAtAlarm;
+            return saveMode(mode -> {
+                mode.getRule().setConditionId(ZenModeConfig.toScheduleConditionId(mSchedule));
+                return mode;
+            });
+        }
+        return false;
+    }
+}