Bugfix: Properly warn of danger for column_reference_added when options provided as 3rd arg

[Stamates]

The current check for when a reference is being added with :add or :add_if_existing doesn't guard for when options are provided as the 3rd argument. This PR fixes the second case below to properly warn of danger.

WARNS OF DANGER ✅

def change do
  alter table("recipes") do
    add :cookbook_id, references("cookbooks")
  end
end

DOES NOT WARN OF DANGER ❌

def change do
  alter table("recipes") do
    add :cookbook_id, references("cookbooks"), null: true
  end
end