[Feature Request] Add `--open` flag to `start-dev` command

[bergundy]

If set, a browser window will be opened (or current one focused) at the UI page.

[cretz]

Isn't knowing the URL enough? What is the use case? If anything, it'd make more sense to put this on the commands that deal with workflows than on the server command that just goes to the root you already know about. (granted you'd need to tell the CLI the URL root).

Also, this should be called --open-browser or something, --open is very generic (I thought it was about SQLite files when I read the title)

[bergundy]

Sure, --open-browser makes sense.

I'd say this is a nice to have and I personally wouldn't use it but for getting started I can see why users would want this.