Binary basic columns should be limitable

[aidanharan]

Binary basic columns should be limitable. So if you have a migration:

create_table "test_table", id: false do |t|
  t.binary_basic "test_col", limit: 16
end

The test_col column should be of type binary_basic(16). Before it was being set to binary_basic(1).

Fixes issue #1248