qa: narrow some string types to non-empty-string

Signed-off-by: Maximilian Bösing <2189546+boesing@users.noreply.github.com>

src/Storage/ClearByNamespaceInterface.php

@@ -6,6 +6,8 @@ interface ClearByNamespaceInterface
 {
  /**
  * Remove items of given namespace
+ *
+ * @param non-empty-string $namespace
  */
  public function clearByNamespace(string $namespace): bool;
 }

src/Storage/ClearByPrefixInterface.php

@@ -6,6 +6,8 @@ interface ClearByPrefixInterface
 {
  /**
  * Remove items matching given prefix
+ *
+ * @param non-empty-string $prefix
  */
  public function clearByPrefix(string $prefix): bool;
 }

src/Storage/MetadataCapableInterface.php

@@ -14,6 +14,7 @@ interface MetadataCapableInterface
  /**
  * Get metadata of an item.
  *
+ * @param non-empty-string $key
  * @return TMetadata|null Metadata on success, null on failure or in case metadata is not accessible.
  * @throws ExceptionInterface
  */

src/Storage/TaggableInterface.php

@@ -8,13 +8,15 @@ interface TaggableInterface
  * Set tags to an item by given key.
  * An empty array will remove all tags.
  *
+ * @param non-empty-string $key
  * @param string[] $tags
  */
  public function setTags(string $key, array $tags): bool;
 
  /**
  * Get tags of an item by given key
  *
+ * @param non-empty-string $key
  * @return string[]|false
  */
  public function getTags(string $key): false|array;