Add and test validation of multiple vs. single file urls #1580
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Addresses concerns raised by #1557.
One thing that's a bit annoying is that the underlying foundation API can only determine if something is a directory URL or not for a url where something already exists, if the directory hasn't already been created, we can't check it. For a file, we're essentially just checking that the last file extension is
.swift
, since there's not really a great way to check it otherwise.