api: Add ZulipStream.isRecentlyActive

In the following commits, this will be used as one of the criteria for
sorting channels in channel link autocomplete.

Author: sm-sayedi

lib/api/model/events.dart

@@ -683,6 +683,8 @@ class ChannelUpdateEvent extends ChannelEvent {
         return value as int?;
       case ChannelPropertyName.channelPostPolicy:
         return ChannelPostPolicy.fromApiValue(value as int);
+      case ChannelPropertyName.isRecentlyActive:
+        return value as bool?;
       case ChannelPropertyName.folderId:
         return value as int?;
       case ChannelPropertyName.canAddSubscribersGroup:

lib/api/model/events.g.dart

@@ -659,6 +659,7 @@ class ZulipStream {
   GroupSettingValue? canSendMessageGroup; // TODO(server-10)
   GroupSettingValue? canSubscribeGroup; // TODO(server-10)
 
+  bool? isRecentlyActive; // TODO(server-10)
   // TODO(server-8): added in FL 199, was previously only on [Subscription] objects
   int? streamWeeklyTraffic;
 
@@ -681,6 +682,7 @@ class ZulipStream {
     required this.canDeleteOwnMessageGroup,
     required this.canSendMessageGroup,
     required this.canSubscribeGroup,
+    required this.isRecentlyActive,
     required this.streamWeeklyTraffic,
   });
 
@@ -705,6 +707,7 @@ class ZulipStream {
       canDeleteOwnMessageGroup: subscription.canDeleteOwnMessageGroup,
       canSendMessageGroup: subscription.canSendMessageGroup,
       canSubscribeGroup: subscription.canSubscribeGroup,
+      isRecentlyActive: subscription.isRecentlyActive,
       streamWeeklyTraffic: subscription.streamWeeklyTraffic,
     );
   }
@@ -742,6 +745,7 @@ enum ChannelPropertyName {
   canDeleteOwnMessageGroup,
   canSendMessageGroup,
   canSubscribeGroup,
+  isRecentlyActive,
   streamWeeklyTraffic;
 
   /// Get a [ChannelPropertyName] from a raw, snake-case string we recognize, else null.
@@ -827,6 +831,7 @@ class Subscription extends ZulipStream {
     required super.canDeleteOwnMessageGroup,
     required super.canSendMessageGroup,
     required super.canSubscribeGroup,
+    required super.isRecentlyActive,
     required super.streamWeeklyTraffic,
     required this.desktopNotifications,
     required this.emailNotifications,

lib/api/model/model.dart

@@ -458,6 +458,8 @@ class ChannelStoreImpl extends HasUserStore with ChannelStore {
             stream.canSendMessageGroup = event.value as GroupSettingValue;
           case ChannelPropertyName.canSubscribeGroup:
             stream.canSubscribeGroup = event.value as GroupSettingValue;
+          case ChannelPropertyName.isRecentlyActive:
+            stream.isRecentlyActive = event.value as bool?;
           case ChannelPropertyName.streamWeeklyTraffic:
             stream.streamWeeklyTraffic = event.value as int?;
         }

lib/api/model/model.g.dart

@@ -471,6 +471,7 @@ ZulipStream stream({
   GroupSettingValue? canDeleteOwnMessageGroup,
   GroupSettingValue? canSendMessageGroup,
   GroupSettingValue? canSubscribeGroup,
+  bool? isRecentlyActive,
   int? streamWeeklyTraffic,
 }) {
   if (channelPostPolicy == null) {
@@ -503,6 +504,7 @@ ZulipStream stream({
     canDeleteOwnMessageGroup: canDeleteOwnMessageGroup ?? GroupSettingValueNamed(nobodyGroup.id),
     canSendMessageGroup: canSendMessageGroup,
     canSubscribeGroup: canSubscribeGroup ?? GroupSettingValueNamed(nobodyGroup.id),
+    isRecentlyActive: isRecentlyActive ?? true,
     streamWeeklyTraffic: streamWeeklyTraffic,
   );
 }
@@ -548,6 +550,7 @@ Subscription subscription(
     canDeleteOwnMessageGroup: stream.canDeleteOwnMessageGroup,
     canSendMessageGroup: stream.canSendMessageGroup,
     canSubscribeGroup: stream.canSubscribeGroup,
+    isRecentlyActive: stream.isRecentlyActive,
     streamWeeklyTraffic: stream.streamWeeklyTraffic,
     desktopNotifications: desktopNotifications ?? false,
     emailNotifications: emailNotifications ?? false,
@@ -1263,6 +1266,8 @@ ChannelUpdateEvent channelUpdateEvent(
       assert(value is int?);
     case ChannelPropertyName.channelPostPolicy:
       assert(value is ChannelPostPolicy);
+    case ChannelPropertyName.isRecentlyActive:
+      assert(value is bool?);
     case ChannelPropertyName.folderId:
       assert(value is int?);
     case ChannelPropertyName.canAddSubscribersGroup: