Better Form Stats (#567)

* Better Form Stats

* fix lint

* submission timer store in localstorage

* Update test case for stats

* remove extra code

* fix form stats

* on restart remove timer

* fix resetTimer function name

* Improve form timer

* Fix timer after form validation error + polish UI

---------

Co-authored-by: Julien Nahum <julien@nahum.net>

api/app/Models/Forms/FormSubmission.php

@@ -11,12 +11,14 @@ class FormSubmission extends Model
 
     protected $fillable = [
         'data',
+        'completion_time',
     ];
 
     protected function casts(): array
     {
         return [
             'data' => 'array',
+            'completion_time' => 'integer',
         ];
     }