Add setCache method to LoaderInterface

Every loader should accept a cache implementation that it will use to
cache loaded resources. And also make it chainable.

src/Loader/Loader.php

@@ -51,9 +51,16 @@ public function afterLoad(callable $callback): void
         $this->addHookCallback('afterLoad', $callback);
     }
 
-    public function setCache(CacheInterface $cache): void
+    public function setCache(CacheInterface $cache): static
     {
         $this->cache = $cache;
+
+        return $this;
+    }
+
+    public function userAgent(): UserAgentInterface
+    {
+        return $this->userAgent;
     }
 
     /**
@@ -92,11 +99,6 @@ protected function callHook(string $hook, mixed ...$arguments): void
         }
     }
 
-    public function userAgent(): UserAgentInterface
-    {
-        return $this->userAgent;
-    }
-
     protected function logger(): LoggerInterface
     {
         return $this->logger;

src/Loader/LoaderInterface.php

@@ -4,6 +4,7 @@
 
 use Crwlr\Crawler\Loader\Http\Exceptions\LoadingException;
 use InvalidArgumentException;
+use Psr\SimpleCache\CacheInterface;
 
 interface LoaderInterface
 {
@@ -21,4 +22,9 @@ public function load(mixed $subject): mixed;
      * @throws LoadingException  Throw one when loading failed.
      */
     public function loadOrFail(mixed $subject): mixed;
+
+    /**
+     * Add an implementation of the PSR-16 CacheInterface that the Loader will use to cache loaded resources.
+     */
+    public function setCache(CacheInterface $cache): static;
 }