Map table columns to model properties

Proposed new feature or change

CREATE TABLE "user" (
  "id" INT PRIMARY KEY,
  "first_name" VARCHAR NOT NULL,
  "last_name" VARCHAR NOT NULL,
  "created_at" INT NOT NULL,
);

final class User extends ActiveRecord
{
    public int $id;
    #[Column('first_name')]
    public string $firstName;
    #[Column('last_name')]
    public string $lastName;
    #[Column('created_at')]
    public string $createdAt;
}

Start with the ActiveRecord model and the Column attributes shown in the issue, then trace how table columns and model properties are currently associated. Implement the proposed mapping for id, first_name, last_name, and created_at, and verify that the User example reads and writes the corresponding columns correctly.