Implement the collapsible feature of conditional card

Add two control views for conditional card to achieve collapsibility.
One of these control views is a footer that is appended to the last
position when expanding all conditional cards. The other is a header
that is used in the collapsed state of conditional cards.

Bug: 119593268
Bug: 113451905
Test: visual, robotests
Change-Id: I39e79b8925a9e3e4ce80c422bcd0ba889aba5f6a

src/com/android/settings/homepage/contextualcards/conditional/ConditionHeaderContextualCard.java

@@ -16,9 +16,12 @@
 
 package com.android.settings.homepage.contextualcards.conditional;
 
+import android.text.TextUtils;
+
 import com.android.settings.homepage.contextualcards.ContextualCard;
 
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Data class representing a condition header {@link ContextualCard}.
@@ -44,6 +47,25 @@ public class ConditionHeaderContextualCard extends ContextualCard {
         return mConditionalCards;
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(getName(), mConditionalCards);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof ConditionHeaderContextualCard)) {
+            return false;
+        }
+        final ConditionHeaderContextualCard that = (ConditionHeaderContextualCard) obj;
+
+        return TextUtils.equals(getName(), that.getName()) && mConditionalCards.equals(
+                that.mConditionalCards);
+    }
+
     public static class Builder extends ContextualCard.Builder {
 
         private List<ContextualCard> mConditionalCards;