Provide custom browser arguments

[Meddington]

Add a new CLI option --browserOptions that allows users to pass browser arguments that will be used when launching a browser instance.

This is useful when testing extensions that require external network access via fetch() or similar. By default accessing external sites is prevented in chromium and requires the --disable-web-security flag. Without this new option a user is left to manual modify the startup arguments.

It's likely that users will run into other cases that require passing in a browser cli argument, so a generic option has been added instead of special casing --disable-web-security.

I didn't spot any unit tests, so no tests are included.

[Meddington]

@microsoft-github-policy-service agree

[aeschli]

Thanks @Meddington, that's a good feature, nice PR.
I changed the option name to --browserOption that can be used multiple times when there is more than one optioto set.
That's what we already do for the -permission argument and is a thing that minimist supports (the library that we use for argument parsing).
That also allows to remove the dependency on shell-quote (the less dependencies, the better)