Create a CLI tool to load data to tables from json files

[brindakv]

It will be useful to create a cli tool to load tables associated with an entry selectively using data in a JSON file (e.g., python load_entry_tables_from_json.py --entry_id <entry_id> --json_file <json_filename> --action <DRY/LOAD>).

It is already used in the backend worklflow for deposition:
https://github.com/informatics-isi-edu/protein-database/blob/master/scripts/pdb_processing/worker/pdb/clientlib/pdb_workflow_processing_lib/client.py#L1318