daemon: add support for getting messages from db

kordophoned/src/daemon/events.rs

@@ -1,5 +1,5 @@
 use tokio::sync::oneshot;
-use kordophone_db::models::Conversation;
+use kordophone_db::models::{Conversation, Message};
 use crate::daemon::settings::Settings;
 
 pub type Reply<T> = oneshot::Sender<T>;
@@ -20,6 +20,12 @@ pub enum Event {
 
     /// Update settings in the database.
     UpdateSettings(Settings, Reply<()>),
+
+    /// Returns all messages for a conversation from the database.
+    /// Parameters: 
+    /// - conversation_id: The ID of the conversation to get messages for.
+    /// - last_message_id: (optional) The ID of the last message to get. If None, all messages are returned.
+    GetMessages(String, Option<String>, Reply<Vec<Message>>),
 }