Added filter: Most recent event date

Civi/DataProcessor/FilterHandler/LastEventDateFilter.php

@@ -118,7 +118,7 @@ class LastEventDateFilter extends AbstractFieldFilterHandler {
    * @param array $submittedValues
    * @return array
    */
-  public function processConfiguration($submittedValues) {
+  public function processConfiguration($submittedValues): array {
     [$datasource, $field] = explode('::', $submittedValues['contact_id_field'], 2);
     $configuration['field'] = $field;
     $configuration['datasource'] = $datasource;