feat: add bot field to contact (#4821)

closes #4647

src/receive_imf.rs

@@ -379,6 +379,8 @@ pub(crate) async fn receive_imf_inner(
         .handle_reports(context, from_id, sent_timestamp, &mime_parser.parts)
         .await;
 
+    from_id.mark_bot(context, mime_parser.is_bot).await?;
+
     Ok(Some(received_msg))
 }