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feat: add `via` query option

Useful for many-to-many joins:

```js
class User extends Model {}
User.table = 'user';
User.fields = {
  id: 'integer'
};

class Group extends Model {}
Group.table = 'user';
Group.fields = {
  id: 'integer'
};

class GroupMembership extends Model {}
GroupMembership.table = 'group_membership';
GroupMembership.fields = {
  userId: { type: 'integer', references: User.fields.id },
  groupId: { type: 'integer', references: Group.fields.id }
};

User.fetch({
  leftJoin: Group.query
    .via(GroupMembership)
    .as('groups')
});
```

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