1.0 beta: How to type select filters `where`?

### Enhancement hasn't been filed before.

- [x] I have verified this enhancement I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

With the new API, how can a variable be typed to what `where` expects?

```ts
const filters = { age: 21 }; // <-- How to type this?

if (search) {
// Error: Property OR does not exist on type
filters.OR = [
{
familyName: {
ilike: `%${search}%`,
},
},
{
givenName: {
ilike: `%${search}%`,
},
},
];
}

const users = await db.query.users.findMany({
where: filters,
limit: 10, // paginated
});
const totalItems = await useDb().$count(users, and(...filters));
```

Background: Sometimes the select filters need to be defined to be reused for multiple queries, e.g. do a findMany and then do a count with the same filters.

BTW: Does $count() not make use of new api?