Fixes #10432 add_column not creating array columns in PostgreSQL

When then PostgreSQL visitor was [added](https://github.com/rails/rails/commit/6b7fdf3bf3675a14eae74acc5241089308153a34)
`add_column` was no longer receiving the column options directly. This
caused the options to be lost along the way.
Merge pull request #10482 from scudco/10432-fix-add-column-with-array

Fixes #10432 add_column not creating array columns in PostgreSQL