feat: add hidden moderator and admin roles, separated as they may be used independently in future (#942)

app/src/main/java/org/thoughtcrime/securesms/groups/OpenGroupManager.kt

@@ -148,8 +148,12 @@ object OpenGroupManager {
         val standardRoles = memberDatabase.getGroupMemberRoles(groupId, standardPublicKey)
         val blindedRoles = blindedPublicKey?.let { memberDatabase.getGroupMemberRoles(groupId, it) } ?: emptyList()
 
-        return GroupMemberRole.ADMIN in standardRoles || GroupMemberRole.MODERATOR in standardRoles ||
-                GroupMemberRole.ADMIN in blindedRoles || GroupMemberRole.MODERATOR in blindedRoles
+        // roles to check against
+        val moderatorRoles = listOf(
+            GroupMemberRole.MODERATOR, GroupMemberRole.ADMIN,
+            GroupMemberRole.HIDDEN_MODERATOR, GroupMemberRole.HIDDEN_ADMIN
+        )
+        return standardRoles.any { it in moderatorRoles } || blindedRoles.any { it in moderatorRoles }
     }
 
 }

libsession/src/main/java/org/session/libsession/messaging/open_groups/GroupMember.kt

@@ -7,5 +7,5 @@ data class GroupMember(
 )
 
 enum class GroupMemberRole {
-    STANDARD, ZOOMBIE, MODERATOR, ADMIN
+    STANDARD, ZOOMBIE, MODERATOR, ADMIN, HIDDEN_MODERATOR, HIDDEN_ADMIN
 }

libsession/src/main/java/org/session/libsession/messaging/sending_receiving/pollers/OpenGroupPoller.kt

@@ -136,10 +136,16 @@ class OpenGroupPoller(private val server: String, private val executorService: S
         pollInfo.details?.moderators?.forEach {
             storage.addGroupMember(GroupMember(groupId, it, GroupMemberRole.MODERATOR))
         }
+        pollInfo.details?.hiddenModerators?.forEach {
+            storage.addGroupMember(GroupMember(groupId, it, GroupMemberRole.HIDDEN_MODERATOR))
+        }
         // - Admins
         pollInfo.details?.admins?.forEach {
             storage.addGroupMember(GroupMember(groupId, it, GroupMemberRole.ADMIN))
         }
+        pollInfo.details?.hiddenAdmins?.forEach {
+            storage.addGroupMember(GroupMember(groupId, it, GroupMemberRole.HIDDEN_ADMIN))
+        }
     }
 
     private fun handleMessages(