Add New fields and backend validation in Sign Up form

Feature: Add Custom Fields in Sign up Form and backend validation for those fields

Description: and Use-case: : New Universal Login SIgnup feature only supports Username, Email and Password. There are few use cases where some I have existing customers who signed up offline and they dont have online account. I would like to get their current customer number that is generated offline and use that in signup form along with some other fields that can go along with the customer number. I would like to see that customer number validated during the sign up process.

It would really great to see this feature for new Universal Login sign up process.

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