EZP-30006: As a Developer I possibility to load several languages at …

…once (#2524)

Introduces API to load several languages at once (specifically by id or locale), exposes more specific methods on languageMask handler and in SPI to make language handling more efficient.

Persistence/Content/Language/Handler.php

@@ -42,6 +42,18 @@ public function update(Language $struct);
      */
     public function load($id);
 
+    /**
+     * Get list of languages by id.
+     *
+     * Missing items (NotFound) will be missing from the returned iterable and not cause an exception, it's up
+     * to calling logic to determine if this should cause exception or not.
+     *
+     * @param array $ids
+     *
+     * @return \eZ\Publish\SPI\Persistence\Content\Language[]|iterable
+     */
+    public function loadList(array $ids): iterable;
+
     /**
      * Get language by Language Code (eg: eng-GB).
      *
@@ -53,6 +65,18 @@ public function load($id);
      */
     public function loadByLanguageCode($languageCode);
 
+    /**
+     * Get list of languages by Language Code (eg: eng-GB).
+     *
+     * Missing items (NotFound) will be missing from the returned iterable and not cause an exception, it's up
+     * to calling logic to determine if this should cause exception or not.
+     *
+     * @param string[] $languageCodes
+     *
+     * @return \eZ\Publish\SPI\Persistence\Content\Language[]|iterable
+     */
+    public function loadListByLanguageCodes(array $languageCodes): iterable;
+
     /**
      * Get all languages.
      *