Implement updates all properties in updateCustomer mutation

[pmclain]

Description (*)

The current schema defines properties that were ignored when processing user
input.

Fixed Issues (if relevant)

1. updateCustomer mutation doesn't update undefined fields #388: updateCustomer mutation doesn't update undefined fields

Manual testing scenarios (*)

1. Create customer

mutation {
    createCustomer(
        input: {
            firstname: "Melanie"
            lastname: "Shaw"
            email: "mshaw@example.com"
            password: "Password1"
        }
    ) {
        customer {
            id
            firstname
            lastname
            email
        }
    }
}

2. Generate customer token required for update mutation
3. Update customer information

mutation {
    updateCustomer(
        input: {
            prefix: "Dr"
            middlename: "Jessica"
            suffix: "Esq"
            dob: "3/11/1972"
            taxvat: "sometaxvat"
        }
    ) {
        customer {
            prefix
            firstname
            middlename
            lastname
            suffix
            dob
            taxvat
        }
    }
}

4. Validate all properties updated as requested

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[naydav]

Please move this data to constructor parameter (values should be set via di)
It more extensible way

BTW maybe we can reuse some data provider for these fields? Do we have the corresponding model in Magento?
Thanks

[naydav]

Check can we reuse dataObjectHelper?

[ghost]

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