Rewrite the array.go to support generic array type?

Hello,

AFAIK this is current use case of Generic Array
```go
//  var x []sql.NullInt64
//  db.QueryRow(`SELECT ARRAY[235, 401]`).Scan(pq.Array(&x))
```

if we can rewrite or add another version of generic array to support the following use case in sqlx

```go
type Foobar struct {
}

type Foo struct {
	Bar pq.GenericArrayV2[bool]
	Baz pq.GenericArrayV2[Foobar]
}
```