IndexFieldSelection preSelect can also be integer (#192)

When you use Index Service to index a relation, the ids are stored in database in INT column.
When you try to use this indexed value in the filter and pre select a value, it cannot be saved because of the typehint.

Steps to reproduce:
1. create a DataObject for FilterDefinition
2. add a "Filter Relation" to Filters
3. chose a value for "Pre Select" field
4. save the DataObject

src/CoreExtensions/ObjectData/IndexFieldSelection.php

@@ -23,14 +23,14 @@ class IndexFieldSelection
     public string $field;
 
     /**
-     * @var string|string[]|null
+     * @var string|string[]|int|null
      */
-    public string|array|null $preSelect;
+    public string|array|int|null $preSelect;
 
     /**
-     * @param string|string[] $preSelect
+     * @param string|string[]|int $preSelect
      */
-    public function __construct(?string $tenant, string $field, array|string|null $preSelect)
+    public function __construct(?string $tenant, string $field, array|string|int|null $preSelect)
     {
         $this->field = $field;
         $this->preSelect = $preSelect;
@@ -50,15 +50,15 @@ public function getField(): string
     /**
      * @param string|string[] $preSelect
      */
-    public function setPreSelect(array|string $preSelect): void
+    public function setPreSelect(array|string|int $preSelect): void
     {
         $this->preSelect = $preSelect;
     }
 
     /**
      * @return string|string[]|null
      */
-    public function getPreSelect(): array|string|null
+    public function getPreSelect(): array|string|int|null
     {
         return $this->preSelect;
     }

src/FilterService/FilterType/AbstractFilterType.php

@@ -81,7 +81,7 @@ protected function getTemplate(AbstractFilterDefinitionType $filterDefinition):
         return $template;
     }
 
-    protected function getPreSelect(AbstractFilterDefinitionType $filterDefinition): array|string|null
+    protected function getPreSelect(AbstractFilterDefinitionType $filterDefinition): array|string|int|null
     {
         $field = $filterDefinition->getField();
         if ($field instanceof IndexFieldSelection) {