Creates a collection on the storage.
A configuration storage can contain multiple sets of configuration objects in partitioned collections. The collection name identifies the current collection used.
Implementations of this method must provide a new instance to avoid side effects caused by the fact that Config objects have their storage injected.
string $collection: The collection name. Valid collection names conform to the following regex [a-zA-Z_.]. A storage does not need to have a collection set. However, if a collection is set, then storage should use it to store configuration in a way that allows retrieval of configuration for a particular collection.
\Drupal\Core\Config\StorageInterface A new instance of the storage backend with the collection set.
public function createCollection($collection);
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