Apply fixes from StyleCI

[joelbutcher]

This pull request applies code style fixes from an analysis carried out by StyleCI.

---

For more information, click here.

[what-the-diff]

PR Summary

• Introduced new library references
  The libraries JoelButcher\Socialstream\ConnectedAccount, Illuminate\Support\Str, JoelButcher\Socialstream\Contracts\CreatesUserFromProvider, JoelButcher\Socialstream\Contracts\SetsUserPasswords, and JoelButcher\Socialstream\Contracts\UpdatesConnectedAccounts have been imported into various files, introducing new functions and capabilities that they provide.

• Removed unused library references
  Cleaner code was achieved by removing unused library references from multiple files. This includes references to DateTimeInterface, App\Models\User, JoelButcher\Socialstream\Tests\TestCase, and other libraries that were not needed in the respective files.

• Code format improvement
  The code readability was improved by adding spaces around the arguments in various functions such as bitbucket(), facebook(), github(), gitlab(), google(), linkedin(), slack(), twitter(), twitterOAuth1(), and twitterOAuth2(). Similarly, space before if conditions in the switchConnectedAccount function is also now introduced. This makes it easier to understand and follow the logic within the code.