Add from_labels method

Author: JerryQ17

sqlx-postgres/src/types/ltree.rs

@@ -95,6 +95,11 @@ impl PgLTree {
         Self::default()
     }
 
+    /// creates ltree from a [`Vec<PgLTreeLabel>`]
+    pub fn from_labels(labels: Vec<PgLTreeLabel>) -> Self {
+        Self { labels }
+    }
+
     /// creates ltree from an iterator with checking labels
     // TODO: this should just be removed but I didn't want to bury it in a massive diff
     #[deprecated = "renamed to `try_from_iter()`"]