JS/Functions: func start takes a long time on first start, without any UI feedback

Reported by @sinedied via Azure E2E reviews:

> Running "func start" on a fresh install on a newly generated project took about ~30s on my macbook pro, stuck on this log:
> 
>
> I almost killed the process thinking that something was wrong, before everything finally started. Subsequent runs were way faster.
>
> I would suggest add a progress indicator, or at least a log that says the CLI is actually doing something, even though I'm used to it I wasn't sure everything was right with only the UI feedback shown in the screenshot during the wait.

https://dev.azure.com/azuretracking/Azure%20tracking/_workitems/edit/1699

Start with the `func start` CLI entry point and reproduce the delay on a fresh install with a newly generated project. The issue names no files or tests; done means the waiting period provides visible progress or a log showing that startup is still working.

Written by the indexing model from the issue text.