Add missing has() method to Cache component

Author: ImperaZim

src/imperazim/components/cache/Cache.php

@@ -62,6 +62,27 @@ public static function get(string $key): mixed {
     return $cacheItem['value'];
   }
 
+  /**
+  * Checks if a cache key exists and is not expired.
+  * @param string $key The cache key.
+  * @return bool True if the key exists and is not expired, false otherwise.
+  */
+  public static function has(string $key): bool {
+    if (!isset(self::$cache[$key])) {
+      return false;
+    }
+
+    $cacheItem = self::$cache[$key];
+
+    // Check if the item has expired
+    if ($cacheItem['expires_at'] !== null && $cacheItem['expires_at'] < time()) {
+      self::invalidate($key);
+      return false;
+    }
+
+    return true;
+  }
+
   /**
   * Invalidates a cached item, removing it from the cache.
   * @param string $key The cache key.