Add ability to define comments

[aeneasr]

For example:

// explain something
create_table("selfservice_registration_requests") {
	t.Column("id", "uuid", {primary: true})
	t.Timestamps()
}

[sio4]

related issue (column scope): #107

could be considered as the same proposal.

---

original comment from #107

I want use like this:

add_column("images", "actual_size", "integer", {null: true, comments:"实际占用空间大小(单位MB)"})

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[github-actions[bot]]

This issue was closed because it has been stalled for 30+7 days with no activity.