Testing the Object Pipeline

[anishapai]

Tests have not been written for the abstracted object pipeline yet.

Things to try breaking for tests:

• Uploading different files/model types via both the postman endpoint and the front-end.
• Changing the model_type parameter in config.py to be something other than video, audio, image.
• Uploading broken files and making sure the POST request fails.
• Testing all object-related methods in db_connection.py