request| feat(NgModule): provide life cycle hooks

[PatrickJS]

With the introduction of NgModule to solve some problems of having to run code before bootstrap. I think it's better to provide lifecycle hooks for these modules for example theses would be great to have

ngBeforeLoad: before loading the module
ngAfterLoad: after the module is loaded
ngBeforeChangeDetection: do something before change detection happens for this module
ngAfterStable: do something after the zones are stable (a great use-case for this is prefetching async lazy routes after boot that doesn't affect the ui)

ngAfterStable is probably the best feature since universal and jasmine can use it

might also help with #9975
also see ng1 .config and .run angular/angular.js#4003

[lacolaco]

IMHO, the constructor of the module class is usable as ngBeforeLoad.
And the bootstrap() function returns a promise that can be used as ngAfterLoad.

ngAfterStable can be replaced by using NgZone and ngZone.onStable.

[PatrickJS]

The benefit of having these lifecycle hooks is giving control back to the developer for modules. For example, if a 3rd party modules does something async in the constructor there's no way to track it or even know there was an async call. If there was an async method then you would know to invoke it.

[jessicajaniuk]

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