Improve collision handling on multiple create calls

[MasterOdin]

Closes #2324

PR adds logic for doing collision avoidance when calling the create command multiple times within the same second. Currently, all files would have the same timestamp, and then ordering would be based on the class name. With this PR, each subsequent call to create will increment the timestamp prefix by N seconds until we get a unique timestamp. This is useful for directions that might have a user run multiple create commands to scaffold their app.

This is technically a backwards breaking change if someone relied on multiple calls to create at the same time to be ordered by classname, but I don't think that's likely, and so I'm not going to worry about it much.