[Woo POS] [Cash & Receipts] View for sending receipt after payment

[iamgabrielma]

After tapping the "Receipt" button we present a view that enables the merchant to input an email to be sent:

• Email is not optional, as it's the only choice.
• There is no sharing
• Email should be validated
• Once sending is completed successfully, start a new order.
• Can be dismissed by tapping x. This could either bring us back to "payment successful" view, or "start a new order" flow.
• Handle success/error on sending email

[dangermattic]

Thanks for reporting! 👍