Support children and pets count in the quote endpoint
Since we can send a booking request with childrenCount and petCount, it
would be nice for the quote endpoint to support these request params too.
If we could send a quote request taking into account
the number of children and pets, we could rely on a single source of truth
to display a final price based on the customer's request.
Right now, we have to compute the total price ourselves from quote + customfee results which could lead to price calculation errors.