Why we create this PR?

This PR contains the following changes:

Prepared the script in python to retrieve any passport aspect data using the dpp backend
Prepared a detailed README.md to instruct on how to execute the script with certain parameters

Script features
Retrieve DPP information using the backend in json format and prints it to the standard output
Prints data retrieval status to console output on each step
Perform authentication from the centrally managed authorization server (keycloak) based on company and user credentials provided by the user
Export enabled/disabled option to export the requested aspect data to a json file
Logging enabled/disabled option to log intermediate retrieval status to a file for further backtracking/debugging/troubleshooting
The backend API and authorization server settings are configurable
Capable to handle exception and error messages

What we want to achieve with this PR?

To achieve the reusable backend objective for reference inplementation

Added script to retrieve any type of aspect data using the dpp backend component
Added README.md on how to execute the script with certain parameters