Ensure prefetch
hook will be called on routes within a lazy engine
#159
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When loading a lazy engine ember-prefetch needs to wait engine routes instantiation. This PR takes a different approach than #150 by waiting any route first.
The lazy engine emulation is taken from https://github.com/emberjs/ember.js/blob/fb91c8a96f5f0f496eeadb167dc4676fe49dcf8c/packages/%40ember/-internals/glimmer/tests/integration/application/engine-test.js