TF-3189 new option to enable/disable subaddressing for a personal folder

model/lib/mailbox/mailbox_constants.dart

@@ -0,0 +1,2 @@
+const String anyoneIdentifier = 'anyone';
+const String postingRight = 'p';

model/lib/mailbox/mailbox_property.dart

@@ -12,4 +12,5 @@ class MailboxProperty {
   static const String myRights = 'myRights';
   static const String isSubscribed = 'isSubscribed';
   static const String namespace = 'namespace';
+  static const String rights = 'rights';
 }

model/lib/mailbox/presentation_mailbox.dart

@@ -48,6 +48,7 @@ class PresentationMailbox with EquatableMixin {
   final MailboxState? state;
   final Namespace? namespace;
   final String? displayName;
+  final Map<String, List<String>?>? rights;
 
   PresentationMailbox(
     this.id,
@@ -67,6 +68,7 @@ class PresentationMailbox with EquatableMixin {
       this.state = MailboxState.activated,
       this.namespace,
       this.displayName,
+      this.rights
     }
   );
 
@@ -88,6 +90,7 @@ class PresentationMailbox with EquatableMixin {
     state,
     namespace,
     displayName,
+    rights
   ];
 
   PresentationMailbox copyWith({