Add a unique modifier

[elnur]

Faker has a unique modifier that forces it to generate unique values. Would be great to have something like that in jFairy.

[robzienert]

+1

[jkubrynski]

Elnur - do you think it should be modifier available to all producers?

[elnur]

@jkubrynski, I think yes, it makes sense to have it for all producers. Is that a complex thing to implement?

[jkubrynski]

It's not trivial ;) We have to rethink how to implement such feature, but it's doable :)

[elnur]

@jkubrynski, any progress on this? :)

[sebastienvermeille]

+1 it would be great !