Implement entity submission services for ThrillWiki

- Added BaseEntitySubmissionService as an abstract base for entity submissions.
- Created specific submission services for entities: Park, Ride, Company, RideModel.
- Implemented create, update, and delete functionalities with moderation workflow.
- Enhanced logging and validation for required fields.
- Addressed foreign key handling and special field processing for each entity type.
- Noted existing issues with JSONField usage in Company submissions.

django/apps/moderation/models.py

@@ -74,6 +74,7 @@ class ContentSubmission(BaseModel):
         ('create', 'Create'),
         ('update', 'Update'),
         ('delete', 'Delete'),
+        ('review', 'Review'),
     ]
     
     submission_type = models.CharField(