Added Causer for Logging Model Events

[jny986]

Added logCauser variable for setting logging of causer if not false and user is logged will add causer to logging
#503

[Gummibeer]

Hey, what exactly should your PR solve/fix? I've added the unittest to the current code base and it passed.
We already set the default causer in

laravel-activitylog/src/ActivityLogger.php

Lines 202 to 213 in 808a3e5

	protected function getActivity(): ActivityContract
	{
	if (! $this->activity instanceof ActivityContract) {
	$this->activity = ActivitylogServiceProvider::getActivityModelInstance();
	$this
	->useLog($this->defaultLogName)
	->withProperties([])
	->causedBy($this->auth->guard($this->authDriver)->user());
	}
	return $this->activity;
	}

[jny986]

@Gummibeer Thanks for pointing that out.

I missed that and it is obviously just that with the 2 different Auth drivers that the person is using in the issue that I linked too that is causing the problem.

Would it be worth changing to using the Auth::user() instead of a configurable driver?

[Gummibeer]

It already uses the default auth driver:

laravel-activitylog/src/ActivityLogger.php

Line 36 in 808a3e5

$this->authDriver = $config['activitylog']['default_auth_driver'] ?? $auth->getDefaultDriver();

So I don't see a benefit in switching to the facade instead of dependency injection.