add getAll method to carrier repo

src/Carrier/CarrierRepository.php

@@ -6,4 +6,9 @@ interface CarrierRepository
 {
     public function find(int $id): ?Carrier;
     public function save(Carrier $carrier): Carrier;
+
+    /**
+     * @return Carrier[]
+     */
+    public function getAll(): array;
 }

tests/Fakes/Carrier/FakeCarrierRepository.php

@@ -36,4 +36,14 @@ class FakeCarrierRepository implements CarrierRepository
     {
         return count($this->existingCarriers);
     }
+
+    public function getAll(): array
+    {
+        return array_map(function (Carrier $carrier) {
+            return new Carrier(
+                $carrier->getId(),
+                $carrier->getEmail()
+            );
+        }, $this->existingCarriers);
+    }
 }