refactor: enhance test runs

[feryardiant]

• Extracts browserstack interactions to dedicated class

  This makes our main class slimmer and less verbose compared to the previous one.

• Move away binary config to its own class

  Previously, when we want to use our own browserstack-local binary we should do like this:

  Creasi\DuskBrowserStack\SupportsBrowserStack::useBrowserStackLocal('path/to/bs-local');

  Now, we should do like this instead

  Creasi\DuskBrowserStack\LocalBinary::use('path/to/bs-local');

• Change LocalProcess constructor signature

  Previously, its first param was browserstack-local binary path, now it only require the array of arguments that will passed to the binary. It's the job of LocalBinary class to handle the path, anyway.

• Change SupportsBrowserStack to WithBrowserStack

  There's nothings wrong with SupportsBrowserStack actually, just to follow the convention using With... as prefix I believe would be better for the long run.

  As of now, I'll keep the SupportsBrowserStack but mark it as deprecated so for those who still using this class won't get any errors when they run their tests.