Refactored the activity service

- Renamed to "ActivityLogger" to be more focused in usage.
- Extracted out query elements to seperate "ActivityQueries" class.
- Removed old 'addForEntity' activity method to limit activity record
  points.

database/factories/Actions/WebhookTrackedEventFactory.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Database\Factories;
+namespace Database\Factories\Actions;
 
 use BookStack\Actions\ActivityType;
 use BookStack\Actions\Webhook;