Allow Expression values to be unique

How: Enable the 'Unique' checkbox for expression fields

Why: Because we create expression based unique fields that cannot be used by the Inriver import adapter

For Who: the Inriver community

Impact: No

Additional context: I don't understand why a unique field validation that already exists in Inriver is being disabled for expressions? Now I am again forced to build an extension to create a unique value from a few fields. Please fix this shortcoming because otherwise we will keep adding extensions to Inriver.

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