SST - Add DynamoDB as a Trigger to the checkCarRegistration.py

[mohammedalsaeed-uob]

A lambda function to checkCarRegistration was made (see #81). Now the DynamoDB trigger must be added to SST as a trigger for the Lambda function.

[mohammedalsaeed-uob]

Reminders for myself because I am not the best with GitHub:

• Pull/Fetch all the changes my teammates made
• Add my code and push