Nested entity request

In [Spira I designed](https://github.com/spira/api-core/blob/d251c715116173e30e336bbd02e44562697d0971/Controllers/ApiController.php#L72) a pattern that allows requests to define what nested entities should be eagerly loaded with the primary request.

eg
```typescript
GET /users With-Nested: profile, friends.profile
```
This should be re-implemented for ubiquits