FEATURE: Pass tags to be flushed to cache backend

Instead of calling the cache backend for each tag to flush
individually, the list of tags is passed to the backend with
the newly introduced `flushByTags` method in
neos/flow-development-collection#2718.

This allows each type of backend to optimise the flushing
of all tags, which can lead to huge performance improvements.
Especially when content is published to the live workspace
which leads to large numbers of cache tags that will be flushed.

Author: Sebobo

Classes/Core/Cache/ContentCache.php

@@ -382,6 +382,17 @@ public function flushByTag($tag)
         return $this->cache->flushByTag($this->sanitizeTag($tag));
     }
 
+    /**
+     * Flush content cache entries by tags
+     *
+     * @param array<string> $tags values that were assigned to a cache entry in Fusion, for example "Everything", "Node_[…]", "NodeType_[…]", "DescendantOf_[…]" whereas "…" is the node identifier or node type respectively
+     * @return integer The number of cache entries which actually have been flushed
+     */
+    public function flushByTags(array $tags): int
+    {
+        return $this->cache->flushByTags($this->sanitizeTags($tags));
+    }
+
     /**
      * Flush all content cache entries
      *