Support multiple hooks per action

It should be possible to add multiple hooks per action. Also let's get rid of mixin-style hooks declaration. Hook should return promise.

```
User.afterCreate = function(data, done) {
Basket.create({userId: this.id}, (err, basket) => {
done(err);
});
};
```

should become

```
User.hooks.after('create', user => Basket.create({userId: user.id}));
```

Old mixin-style should be deprecated from next stable version.

Look at the ORM's hook system, likely in a hooks or lifecycle module. Understand how hooks are currently attached (mixin-style) and the data flow. The change involves designing a new API for multiple promises per action and deprecating the old style. Check existing tests for hooks to understand the expected behavior.

Scritto dal modello di indicizzazione a partire dal testo della issue.