feat: add download logs action

INT-667

Needs myparcelnl/pdk#288
Needs myparcelnl/js-pdk#221

src/Pdk/Logger/PsLogger.php

@@ -48,6 +48,16 @@ public function __construct(FileSystemInterface $fileSystem)
         $this->createLogDirectory();
     }
 
+    /**
+     * @return string[]
+     */
+    public function getLogFiles(): array
+    {
+        return array_map(function (string $level): string {
+            return $this->getLogFilename($level);
+        }, self::LOG_LEVELS);
+    }
+
     /**
      * @param  string                  $level
      * @param  \Throwable|array|string $message