feat: add date_taken field to media model and update related functionalities

libertas_core/src/repositories.rs

@@ -18,6 +18,7 @@ pub trait MediaRepository: Send + Sync {
         width: Option<i32>,
         height: Option<i32>,
         location: Option<String>,
+        date_taken: Option<chrono::DateTime<chrono::Utc>>,
     ) -> CoreResult<()>;
     async fn delete(&self, id: Uuid) -> CoreResult<()>;
 }