fix(postgres): addColumn support ARRAY(ENUM)

[sushantdhiman]

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Description of change

Closes #10561

[mieszko4]

For some reason I was convinced that test have to cover all dialects.
Unfortunately my pr without answer (#10561 (comment)) was hanging for a year, I could have done that if myself if someone had replied to me in the thread that I can test for just one dialect.

On one side I am happy we merged my fix, on the other I am sad I won't show as the contributor for it although this is a clear c/p of my pr.

[sushantdhiman]

Hey @mieszko4, ARRAY(ENUM) is postgres only feature, so we only need to cover postgres. Sorry that original PR was left in limbo. I could have commented there but

1. I wasn't sure if author will still respond after a year
2. Main code and test needed some improvement, which would have taken some extra time.

So I improved code and merged it. Thanks for you initial work

[mieszko4]

Hey @sushantdhiman, sure, no problem, I understand. thnx for the explanation and your contribution overall!