feat: Sync chat contacts across devices (#4953)

Sync chat contacts across devices for broadcast lists and groups. This needs the corresponding chat
to exist on other devices which is not the case for unpromoted groups, so it fails for them now but
it's only a warning and will work once creation of unpromoted groups is synchronised too.

src/securejoin.rs

@@ -21,6 +21,7 @@ use crate::param::Param;
 use crate::peerstate::{Peerstate, PeerstateKeyType};
 use crate::qr::check_qr;
 use crate::stock_str;
+use crate::sync::Sync::*;
 use crate::token;
 use crate::tools::time;
 
@@ -443,8 +444,14 @@ pub(crate) async fn handle_securejoin_handshake(
                 match chat::get_chat_id_by_grpid(context, field_grpid).await? {
                     Some((group_chat_id, _, _)) => {
                         secure_connection_established(context, contact_id, group_chat_id).await?;
-                        chat::add_contact_to_chat_ex(context, group_chat_id, contact_id, true)
-                            .await?;
+                        chat::add_contact_to_chat_ex(
+                            context,
+                            Nosync,
+                            group_chat_id,
+                            contact_id,
+                            true,
+                        )
+                        .await?;
                     }
                     None => bail!("Chat {} not found", &field_grpid),
                 }