🐛 fix(models.py): add ClinicalTrialNumber model to support storing clinical...

🐛 fix(models.py): add ClinicalTrialNumber model to support storing clinical trial number information
🐛 fix(models.py): add clinical_trial_number field to Item model to establish a many-to-many relationship with ClinicalTrialNumber model
🐛 fix(sqlite.py): add create_clinical_trial_number_objects function to create ClinicalTrialNumber objects and associate them with WorkItem
🐛 fix(sqlite.py): modify create_relation_objects function to use add method instead of append for many-to-many relationship fields
🐛 fix(sqlite.py): add "clinical-trial-number" key to items_processed list in scan_item function to properly process clinical trial number information