Add validation on hooks definition

Actually we have two types of bundle hooks definition:

One (normal methods):
```js
{
  methodOne: [function,function],
  methodTwo: [function, function]
}
```

Two (getters and setters):
```js
{
  methodOne: [function, function],
  methodTwo: {
    get: [function, function],
    set: [function, function]
  }
}
```