Persist line items in cart when user logs in

[pkrawat1]

Why?

• When a guest user adds products to the cart, he/she is not able to persist the cart after logging in.

This change fixes need by:-

1. Guest user
   • 1. Check for localstorage order details, to find the order.
   • 2. Create new order if not found.
2. Logged in User
   • 1. Get user current user from api.
   • 2. If not current order, then check for localstorage order details, to find the order.
   • 3. Create new order if not found.