[4.x] Add Generics to HasApiTokens

[cosmastech]

This adds generics to HasApiTokens to aid in static analysis.

This should be beneficial to folks who are overriding the default Sanctum models as outlined in the docs, but also should provide IDE typehint && static analysis benefits.

If you are overriding the personal access token model, then you would add this to your tokenable model.

class User extends Authenticatable
{
    /** @use HasApiTokens<TeamworksAccessToken> */
    use HasApiTokens;

    // ...
}

Otherwise, the default for the generic is already set.

As a bonus, it also adds the generics for tokens() relationship to keep in line with Laravel's MorphMany's generics.

Outstanding Question

Should the same generics be added to the Contracts/HasApiTokens interface? 🤔

[unre4l]

Small question, how does this go with https://github.com/laravel/sanctum/blob/4.x/src/Guard.php#L59 ? TransientToken doesnt align with TTokenModel of \Illuminate\Database\Eloquent\Model part.

[cosmastech]

Small question, how does this go with https://github.com/laravel/sanctum/blob/4.x/src/Guard.php#L59 ? TransientToken doesnt align with TTokenModel of \Illuminate\Database\Eloquent\Model part.

Ugh. I think you're right about that 😢 . I'll try a PR to remove the Model part.