Checking that the platform supports foreign key is not the right case
here, because we should check if we can create them by themselves, after
the table is created. It is not the case for Sqlite.

Closes #3990

Upstream libs and tools have improvements that make them unnecessary.

By either defining their types or renaming to match parent class (or
interface).

The failures are caused by the changes in PHP according to https://wiki.php.net/rfc/notice-for-non-valid-array-container.

Change "we're" to "where" in docblock for listTableColumns()
method. Add comma to improve readability.