title: add expire time for validation and verification in Djoser
body: <p>I'm using Django==4.0.3 ,djangorestframework==3.13.1 and djangorestframework-simplejwt==5.1.0 and djoser==2.1.0 I have used djoser to authenticate, and all works fine.</p>
  <p>how can add expiration datetime for validation and verification link in Djoser ?
  any idea ?</p>