text: Title: Request: Add sameSite parameter to unset_cookie
  Body: It would be appreciated if I could use the _unset_cookie_ method to unset a cookie I created with the parameter _sameSite='None'_. Otherwise, I'm forced to use _set_cookie_ for the sole purpose of unsetting that cookie...
  
  With current behaviour, _sameSite_ is set to 'Lax' by default and so the browser ignores it because I'm using different domains for front and backend, and so using Cross Site requests. 
  
  Thank you