Added a config option to change the auth id function and updated base model to use it

Author: qschmick

config/model-auditlog.php

@@ -51,4 +51,9 @@
         'created_at',
         'updated_at',
     ],
+
+    /*
+     * Function on the auth service provider that will return the user id editing a model
+     */
+    'auth_id_function' => 'id',
 ];

src/Models/BaseModel.php

@@ -41,6 +41,11 @@ public static function recordChanges(int $event_type, $model) : void
                 $log->event_type = $event_type;
                 $log->subject_id = $model->getKey();
                 $log->occurred_at = now();
+
+                if (config('model-auditlog.enable_user_foreign_keys')) {
+                    $log->user_id = \Auth::{config('model-auditlog.auth_id_function', 'id')}();
+                }
+
                 $log->setAttribute('field_name', $key);
                 $log->setAttribute('field_value_old', $model->getOriginal($key));
                 $log->setAttribute('field_value_new', $change);