Commits on Jul 30, 2020

1. feat(core): type safe references …

   EM now returns `Loaded<T, P>` instead of the entity (`T`). This type automatically
   adds synchronous method `get()` that returns the entity (for references) or array
   of entities (for collections).
   
   There is also `$` property that contains the same as return value of this `get()`
   method.
   
   ```typescript
   const book1 = await orm.em.findOneOrFail(Book, bible, { populate: ['publisher', 'tags'] });
   expect(book1.publisher!.$.name).toBe('Publisher 123');
   expect(book1.tags!.$[0].name).toBe('t1');
   expect(book1.tags!.$[1].name).toBe('t2');
   expect(book1.tags!.$[2].name).toBe('t3');
   orm.em.clear();
   
   const books = await orm.em.find(Book, { id: bible.id }, { populate:
     { publisher: { books: { publisher: true } } },
   });
   expect(books[0].publisher!.$.books.$[0].publisher!.$.name).toBe('Publisher 123');
   
   const book5 = await orm.em.findOneOrFail(Book, bible, { populate:
     { publisher: true, tags: true, perex: true },
   });
   expect(book5.publisher!.$.name).toBe('Publisher 123');
   expect(book5.tags.$[0].name).toBe('t1');
   ```
   
   Closes #214
   
   BREAKING CHANGE:
   `Reference.get()` is now available only with correct `Loaded` type hint and is used
   as a sync getter for the entity, just like `unwrap()`. You can use `Reference.load(prop)`
   for the original `get()` method functionality.
   
   `em.find()` and similar methods now have two type arguments, due to TypeScript not supporting
   partial type inference, it is no longer possible to specify the `T` explicitly (without also
   explicitly specifying the load hint).

   

   B4nan committed Jul 30, 2020
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