Add support for additional info of columns

[raderio]

For example if a column has a type different from standard(string, number, ...) we must be able to add that specific info.

For example for this issue solution could be:

CREATE TYPE PRODUCT AS ENUM ('phone', 'laptop', 'mouse');

CREATE TABLE products (
    id BIGSERIAL NOT NULL PRIMARY KEY,
    title VARCHAR(20) NOT NULL,
    type PRODUCT NOT NULL
);

<dataset>
    <products id="1" title="Pixel">
        <column name="type" type="PRODUCT" value="laptop" />
    </products>
</dataset>

[raderio]

Other syntax could be

<dataset>
    <products id="1" title="Pixel" type:Product="laptop" />
</dataset>

[raderio]

https://sourceforge.net/p/dbunit/feature-requests/204/