Add get element from session (#82)

* Add methods to interface and implementation

* Apply php-cs-fixer changes

Author: mattamon

src/Models/Element/ServiceResolver.php

@@ -62,4 +62,13 @@ public function getSafeCopyName(string $sourceKey, ElementInterface $target): st
     {
         return Service::getSafeCopyName($sourceKey, $target);
     }
+
+    public function getElementFromSession(
+        string $type,
+        int $elementId,
+        string $sessionId,
+        ?string $postfix = ''
+    ): null|Asset|AbstractObject|Document {
+        return Service::getElementFromSession($type, $elementId, $sessionId, $postfix);
+    }
 }

src/Models/Element/ServiceResolverInterface.php

@@ -48,4 +48,11 @@ public function isPublished(ElementInterface $element = null): bool;
     public function getValidKey(string $key, string $type): string;
 
     public function getSafeCopyName(string $sourceKey, ElementInterface $target): string;
+
+    public function getElementFromSession(
+        string $type,
+        int $elementId,
+        string $sessionId,
+        ?string $postfix = ''
+    ): null|Asset|AbstractObject|Document;
 }