Conversation.Mode: add isSwarm

Change-Id: Ia4fffe64aff570b38194db3a8be699611b896502

jami-android/libjamiclient/src/main/kotlin/net/jami/model/Conversation.kt

@@ -785,7 +785,10 @@ class Conversation : ConversationHistory {
 
     enum class Mode {
         OneToOne, AdminInvitesOnly, InvitesOnly,  // Non-daemon modes
-        Syncing, Public, Legacy, Request
+        Syncing, Public, Legacy, Request;
+
+        val isSwarm: Boolean
+            get() = this == OneToOne || this == InvitesOnly || this == Public
     }
 
     interface ConversationActionCallback {