Provide the anonymized csv file in the output directory

[sowmyasgkrishnan]

As an anonymizer user,
When I run the application,
Anonymized output needs to be created in the output directory with the name <input_file_name>_anonymized_.csv.
input_file_name here is obtained from the config json that is passed as an input to the application.
output_directory needs to be obtained from the config json file as a parameter in the 'anonymize' section.

Considerations:

1. An empty output file needs to be created if the input file is empty
2. If no PII detected in the fields, the same input file needs to be available as the anonymized version.
3. In the course of errors during anonymization, no file should be created and appropriate error message should be available to the user.