Allow users to set types for all id columns

[vassilevsky]

Hello :)

Thank you for the wonderful gem!

We use UUID for all id columns and this is something that we would need.

Let me know if anything else is needed.

[fatkodima]

I don't think this is that hard to do it manually, after migration was generated, to complicate things.
So I'm 👎 on this.

[vassilevsky]

Yep, it's really easy to edit the generated migration. Do you think all options can be removed then?

[fatkodima]

Yes, I think so. I have proposed that here #430 (comment)
but has not yet received any feedback.

[josephpage]

I think it should be completely removed, but it should use the default column type from Rails.
The one which can be configured with

config.generators do |g|
  g.orm :active_record, primary_key_type: :uuid
end

I can work on it in my PR #433

[vassilevsky]

I have created #434 that completely removes options instead :)