Deny adding identity if the email differs from the current logged-in user email

Enhancement description

When adding an identity to an existing Appwrite account, the identity's email address should match the email address of the currently authenticated user.

Currently, it is possible to add an identity with an email address that differs from the email address associated with the current user account. It is rarely a good UX, as users may unintentionally link an identity to the wrong account or end up with multiple unrelated email addresses associated with the same account.

It would be better to deny adding identities with a different email address.

Pitch

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