Fix for considering new go files in dev filesystem watcher

[scottopell]

What is this

Adds support for watching for creation of new files while running wails dev.

Motivation

I encountered a bug where updates to my go files were not resulting in a refresh of the wails app.

I added some logging to see what events were coming out of fsnotify and I found that when I wrote updates to my code, fsnotify was picking up a sequence of REMOVE CREATE CHMOD events instead of a WRITE as this code was expecting.

Tested and working on macOS 12.4.

FSNotify Event Item:  "/Users/scottopell/dev/heaprof/app.go": REMOVE
FSNotify Event Item:  "/Users/scottopell/dev/heaprof/app.go": CREATE
FSNotify Event Item:  "/Users/scottopell/dev/heaprof/app.go": CHMOD

[leaanthony]

Nice catch @scottopell! PR looks good too. Thanks heaps! 👍