Application instance initializers

[hefox]

Currently ember-cli-migrator is not converting application and instance initializers

I looked it into briefly and it'd take considerable effort to convert it (at least for someone like me who is not too familiar with ast), as they're not typed exports so would need specialized/new logic

https://guides.emberjs.com/v2.2.0/applications/initializers/ ember-cli/ember-cli#2888