Not getting any type safety from registering Fragments with FragmentRegistry

[canrozanes]

Just upgraded to v5.0.0.beta9 and noticed an issue with types that has to do with registering fragments in FragmentRegistry.

Say I have the following

// app/models/address.ts
import Fragment from 'ember-data-model-fragments/fragment';
import { attr } from '@ember-data/model';

export default class Address extends Fragment {
  @attr('string') declare street: string;
  @attr('string') declare city: string;
}

And then consume the fragment above, in the model below

// app/models/person.js
import Model, { attr } from 'ember-data/model';
import { fragment } from 'ember-data-model-fragments/attributes';
import Address from 'app/models/address'

export default Person extends Model {
  @attr('string') declare name: string;
  @fragment('address') declare address: Address;
}

I should get a type error on `@fragment('address') because I forgot to register my fragment with the following syntax:

declare module 'ember-data-model-fragments/types/registries/fragment' {
  export default interface FragmentRegistry {
    address: AddressFragment;
  }
}

If ember data is our example, the syntax error should read:

Argument of type '"address"' is not assignable to parameter of type 'keyof FragmentRegistry'.

However, currently I get no errors.