Implement Check constraints for column definitions

creating table shouldn't even be possible as col is i and we r dng J>=18.
and it should also doesn't respect whatever we pass into check() even if we r dng i>=18

```
turso> CREATE TABLE t1 (
    i INTEGER CHECK(j >= 18)
);
turso> .tables
t1
turso> insert into t1(i) values(1);
turso> select * from t1;
┌───┐
│ i │
├───┤
│ 1 │
└───┘
```