Incorrect TypeScript definition for addConstraint

[pigulla]

Describe the bug

When calling addConstraint, using an object as the second parameter causes a TypeScript error:

TS2345: Argument of type '{ check: string; }' is not assignable to parameter of type 'string'.

This was presumably introduced in #1129 when a union type seems to have been accidentally refactored into an intersection type (diff).

Steps to reproduce

Create a TypeScript migration:

import { type MigrationBuilder } from 'node-pg-migrate';

export function up(pgm: MigrationBuilder): void {
  pgm.createTable('my_table', {
    my_column: {
      type: 'VARCHAR(255)',
    },
  });
  pgm.createConstraint('my_table', 'my_column', {
    check: 'my_column IS NOT NULL'
  });
}

Logs

No response

System Info

System:
  OS: Linux 5.10 Debian GNU/Linux 11 (bullseye) 11 (bullseye)
  CPU: (6) arm64 unknown
  Memory: 5.02 GB / 15.61 GB
  Container: Yes
  Shell: 5.8 - /usr/bin/zsh
Binaries:
  Node: 18.20.2 - ~/n/bin/node
  npm: 10.5.0 - ~/n/bin/npm

Used Module System

cjs