feat: Set min and max values not required for int values

[wwoytenko]

Unset the required flag on min and max params so users can generate values in the min and max limit of type.

For instance

        - name: "RandomInt"
          params:
            column: "id"
            min: 1

In that case, if column id is int4 then the min value is 1 and the max value will be 2,147,483,647