client: Started working on ability to sync messages after last known message

kordophone/src/api/mod.rs

@@ -1,6 +1,6 @@
 use async_trait::async_trait;
 pub use crate::model::{
-    Conversation, Message, ConversationID
+    Conversation, Message, ConversationID, MessageID,
 };
 use crate::model::JwtToken;
 
@@ -20,7 +20,13 @@ pub trait APIInterface {
     async fn get_conversations(&mut self) -> Result<Vec<Conversation>, Self::Error>;
 
     // (GET) /messages
-    async fn get_messages(&mut self, conversation_id: &ConversationID) -> Result<Vec<Message>, Self::Error>;
+    async fn get_messages(
+        &mut self, 
+        conversation_id: &ConversationID,
+        limit: Option<u32>,
+        before: Option<MessageID>,
+        after: Option<MessageID>,
+    ) -> Result<Vec<Message>, Self::Error>;
 
     // (POST) /authenticate
     async fn authenticate(&mut self, credentials: Credentials) -> Result<JwtToken, Self::Error>;