Add cmdline examples to launch chromium with k6 browser default flags

[ka3de]

Now that k6 browser supports connect method, in order to connect to a remotely running browser, instead of launching one, it would be useful to provide cmdline snippets that can be easily used in order to launch a Google Chrome browser with the same default arguments that k6 browser implementation uses when launching it.

See the list of default Chrome flags in k6 browser implementation:

Related: https://github.com/grafana/k6-docs/pull/1042