feat(core): implement message tasks

includes:
- acknowledgements
- last_message_id
- embeds
- web push

crates/core/database/src/util/bridge/v0.rs

@@ -391,6 +391,16 @@ impl From<crate::Interactions> for Interactions {
     }
 }
 
+impl From<crate::AppendMessage> for AppendMessage {
+    fn from(value: crate::AppendMessage) -> Self {
+        AppendMessage {
+            embeds: value
+                .embeds
+                .map(|embeds| embeds.into_iter().map(|embed| embed.into()).collect()),
+        }
+    }
+}
+
 impl From<crate::Masquerade> for Masquerade {
     fn from(value: crate::Masquerade) -> Self {
         Masquerade {