feat: support passing electron arguments for dev command

[bgever]

Adds support for the -- <args...> option on the dev command, and passes the remainder of the arguments (similar to npm start) to the underlying electron CLI executable.

This allows for passing arguments to the main.js in case the app supports processing CLI arguments.

• Example 1:
  electron-snowpack dev --verbose -- --myarg example -e=example --example2 'example 2'
• Example 2 (with electron-snowpack dev as the start script in package.json):
  npm start -- --verbose -- --myarg example -e=example --example2 'example 2'

The commander implementation automatically removes consumed arguments from the program.args array (like the --verbose in the previous example, and adds any "unconsumed" arguments after -- to the args property. The command name needs to be explicitly removed.

[bgever]

@karolis-sh Hope you find this feature useful. 😊 I'm using it locally to work with my app's CLI in dev mode.

[karolis-sh]

Thanks for the solid contribution! 👍

[bgever]

Thanks for accepting the PR and quick release. 🎉 And thanks for adding the example to the playground.