Create trigger queue / subscription automatically

Today, a function cannot be triggered if there’s no queue / subscription to listen to. And there’s no way to automatically provision those. Which requires the following hack: https://weblogs.asp.net/sfeldman/automatic-queue-creation-for-function. With some reflection (follow up post) it can be simplified but it would be great to have this feature ootb.

No source file, test, or entry point is identified in the issue. Start by reviewing the linked automatic queue-creation approach and the host's trigger provisioning behavior; done should mean a function can be triggered without a pre-existing queue or subscription and those resources are provisioned automatically.

Written by the indexing model from the issue text.