Allow to disable browser open action via CLI

[alexgorbatchev]

Is your feature request related to a problem? Please describe.
In an iterative scenario when you need to restart ladle dev multiple times, it's annoying loosing terminal focus and having multiple browser tabs opening.

Describe the solution you'd like
Would be good to have --no-open or similar option to disable browser open behavior.

Describe alternatives you've considered
None.

Additional context
None.

[nevir]

This would also be useful for setting up VS Code debugging through ladle: have a task that starts the server, and a browser launch config that can open its own browser instance / attach the debugger

[nevir]

This appears undocumented, but if you modify your vite.config to include server: { open: false } it will disable the browser launching

https://github.com/tajo/ladle/blob/main/packages/ladle/lib/cli/vite-dev.js#L126-L131