implement SearchUsers use case

backend/app/User/EloquentUserRepository.php

@@ -43,6 +43,25 @@ class EloquentUserRepository implements UserRepository
         return $model === null ? null : $this->toDomain($model);
     }
 
+    /**
+     * @return User[]
+     */
+    public function search(string $query): array
+    {
+        $like = strtolower($query).'%';
+        $models = UserModel::query()
+            ->whereRaw('LOWER(display_name) LIKE ?', [$like])
+            ->orWhereRaw('LOWER(email) LIKE ?', [$like])
+            ->orderBy('display_name')
+            ->get();
+
+        return $models->map(
+            function (UserModel $model) {
+                return $this->toDomain($model);
+            },
+        )->all();
+    }
+
     /**
      * @throws RuntimeException
      */