API: Added audit log list endpoint

Not yested covered with testing.
Changes database columns for more presentable names and for future use
to connect additional model types.
For #4316

app/Entities/Models/Entity.php

@@ -137,7 +137,7 @@ abstract class Entity extends Model implements Sluggable, Favouritable, Viewable
      */
     public function activity(): MorphMany
     {
-        return $this->morphMany(Activity::class, 'entity')
+        return $this->morphMany(Activity::class, 'loggable')
             ->orderBy('created_at', 'desc');
     }