Let User field to be required to be unique

[fubuloubu]

Describe the bug

If you want to add a field that should be globally unique (within a tenent) such as a username, it is currently not possible to specify that

To Reproduce

Steps to reproduce the behavior:

1. Go to 'User fields'
2. Click on 'Create User Field'
3. No way to add unique constraint on field

Expected behavior

A checkbox in this form that adds a UNIQUE constraint on the field should be available, at least on some field types such as string, phone number, maybe address, etc.

Configuration

• Cloud or self-hosted: self-hosted (Railway)
• If self-hosted, Fief version: 0.28.6

Additional context

I want to protect the privacy of my user's emails by only allowing account search via username

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